Heat a small skillet over medium heat and add the sesame oil, cashews and chili powder, toss well. Cook over medium heat until lightly toasted and browned, about five minutes. During the last minute of cooking add in the honey (I used 2 tablespoons). Remove from the heat and add the lime zest and 1 tablespoon black sesame seeds. Toss well and set aside.: The moment the sesame oil warms you will notice a toasty aroma that signals the perfect start. The cashews should sizzle gently when they hit the pan, and you will see small bubbles form around them as the oil heats. Stir continually so each nut gets kissed with heat and color, aiming for an even golden brown, which takes about five minutes. Listen for a soft crackle rather than a loud pop; high popping means the oil is too hot. During the last minute add the honey and watch it bubble and become glossy, coating the nuts. If the pan smokes, lower the heat immediately, because burnt oil will make the cashews bitter. Remove them while still slightly lighter than you think, because residual heat continues to darken them off the stove.
Add the steak to a glass pyrex dish or gallon size ziplock bag.: Once off heat, the cashews will still be hot and will readily accept the fragrant lime zest , which releases volatile citrus oils when it contacts warmth. Toss right away so the zest and the toasted sesame seeds adhere to the honey glaze, creating a shiny, aromatic coating. The lime zest gives a lifted brightness that prevents the nuts from tasting too sweet. A common mistake is letting the nuts cool before adding zest, which reduces aromatic transfer. Cool on a plate in a single layer to prevent steaming and sogginess.
In a glass measuring cup or bowl whisk together the lime juice + zest, fish sauce, ponzu sauce, sweet thai chili sauce, garlic and ginger. Pour about 1/4 -1/3 of the dressing over the steak, cover or seal the bag and place in the fridge while you prep the rest of the salad, at least 15 minutes (the longer the better).: Choose a nonreactive container so the marinade can work without affecting flavor. You should hear the steak hit the dish, and the raw meat should look glossy from its surface moisture. Place it flat so the marinade can coat evenly. Avoid using a metallic container if your marinade contains a lot of acid, because it can impart off notes. Sealing the bag well helps the marinade contact the meat fully, which leads to better flavor penetration.
Meanwhile add the tahini to a small bowl and microwave until melted and smooth, about 15-20 seconds. Add the melted tahini to the dressing, whisk until smooth. Taste and add more tahini or sweet thai chili sauce to your liking, set aside.: As you whisk, the dressing will thin and the aromatics will bloom, releasing a heady scent of garlic and ginger . The citrus and fish sauce form a tangy salty backbone while the sweet thai chili builds sweetness and heat. Whisk briskly until integrated; the mixture should look slightly glossy. If it separates, add a little more tahini later to bind. One mistake is not tasting while you build the dressing; adjust salt and sweetness now so you do not overcorrect later.
In a large bowl add the kale, edamame, carrots, bell peppers, mango chunks, lemon grass and green onions. Give it all a good toss.: The steak will take on a glistening sheen as the dressing cloaks it. In the fridge the acid and aromatics will start to tenderize the surface while infusing flavor. I usually let it sit longer when I have time, because the longer marination deepens taste, but avoid overnight for too long or the texture can become mushy. A common issue is under marinating, which leaves the steak bland, or over marinating, which affects texture negatively.
Heat a grill or grill pan to high heat.: Warming the tahini makes it pourable and easier to whisk into the dressing, and you will notice it loosen and shine. Stir to ensure there are no lumps, then incorporate it into the dressing. The tahini will thicken slightly as it cools, so get the balance right while it is warm. Do not overheat it to the point of smoking, because that changes the flavor. If your tahini is very thick, add a teaspoon of warm water to help smooth it.
Once hot sear the steak for 5-8 minutes, flip and sear another 5 minutes or until your desired doneness is reached. Remove the steak and allow to rest 5 minutes. Slice steak thinly against the grain and add to the salad. Add the dressing and remaining sesame seeds. Toss to coat and massage the dressing into the veggies for 1-2 minutes. Add the eggs and cashews. Serve warm or cover and place in the fridge until ready to eat. I personally love this served warm.: Once combined, the dressing should feel creamy and coat the back of a spoon. The tahini rounds out the acid and sweetness, creating a velvety mouthfeel. Taste attentively and adjust by adding more tahini for creaminess or more sweet thai chili for spice and body. A common error is adding too much liquid at once, which thins the dressing and dilutes flavor intensity.
In a large bowl add the kale, edamame, carrots, bell peppers, mango chunks, lemon grass and green onions: The bowl will look vibrant with pops of orange, green, and yellow, and when you toss gently you should hear the crispness of the bell peppers and the slight rustle of herbs. The lemongrass should be finely chopped so its citrusy fibers distribute without being chewy. Toss until the mix looks evenly distributed and colorful. Avoid overdressing the greens now if you plan to refrigerate, to keep texture intact.
Give it all a good toss: Tossing releases the aroma of the herbs and combines textures so each forkful is balanced. You should feel the ingredients move easily against each other, and the mango pieces should mingle without getting crushed. One pitfall is tossing too vigorously, which can bruise delicate herbs and make the salad sloppy, so be gentle but thorough.
Heat a grill or grill pan to high heat: You want a surface so hot it glows with readiness, which will create a satisfying sear on the steak . When a drop of water dances and evaporates instantly, your surface is ready. Preheating properly ensures good caramelization and that the steak will sear rather than steam. If the grill is not hot enough, you will not get those caramelized brown bits that give so much flavor.
Once hot sear the steak for 5 to 8 minutes, flip and sear another 5 minutes or until your desired doneness is reached: As the steak meets the hot surface you should hear a sharp sizzle and see browning start to form. The crust develops quickly, and flipping only once preserves juiciness. Use the 5 to 8 minute windows as a guide and check doneness with a thermometer if you want precision. Overcooking is the most common error here, which yields dry meat, so aim for medium rare to medium for optimal tenderness and flavor.
Remove the steak and allow to rest 5 minutes: Resting lets the juices redistribute so the sliced steak remains moist. You will notice the surface relax and the internal juices settle during this pause. Tent loosely with foil to keep warm, but avoid wrapping tightly as that can steam the meat. Cutting too soon is a frequent mistake that causes juices to pool on the cutting board instead of staying in the meat.
Slice steak thinly against the grain and add to the salad: Slicing against the grain shortens muscle fibers, which makes each bite tender. The slices should reveal a pink center if cooked to medium rare, and the edges will show a caramelized crust. Arrange the slices over the greens so the steak juices mingle with the salad. Cutting with the grain makes the steak chewy, so be sure to locate the fibers and slice perpendicular.
Add the dressing and remaining sesame seeds: Drizzle the reserved dressing over the assembled salad and watch it glint on the leaves and meat. The sesame seeds will add a final toasty note and visual contrast. Toss gently to distribute the dressing, ensuring the tahini coats ingredients evenly. Adding all the dressing at once can drown delicate herbs, so adjust as needed.
Toss to coat and massage the dressing into the veggies for 1 to 2 minutes: Massaging the kale and veggies helps the dressing penetrate and soften the greens slightly, improving mouthfeel. You should feel the leaves become supple and glossy, and the dressing should cling to each piece. One common mistake is stopping too soon, leaving pockets of undressed kale, so give it a minute or two to marry properly.
Add the eggs and cashews: Scatter the chopped hard boiled eggs and the warm or cooled cashews over the salad so they sit as textural highlights. The eggs add creaminess, and the cashews bring that sweet spicy crunch. Place them on top at the end to preserve their texture; mixing them in too early can make the cashews soggy or the eggs break down.
Serve warm or cover and place in the fridge until ready to eat: This salad works both slightly warm and chilled, and both approaches change the experience. Warm will emphasize the steak and toasted aromatics, while chilled lets the herbs and dressing settle into the kale. If refrigerating, wait until the salad reaches room temperature before serving for best flavor. Leaving it out too long at warm temperatures can be unsafe, so refrigerate promptly if you will eat later.