Preheat outdoor grill.: You will notice the scent of wood or charcoal if using those fuels, and the air will warm quickly around the grill as the metal heats. Getting the grill to a steady medium high ensures the franks develop a pleasing char without burning, which gives a smoky backdrop that pairs with the bright corn salad. A common mistake is rushing this step and placing franks on a cool grate, which yields little color and a rubbery texture. Aim for visible heat lines and a light sizzle when the frank first hits the grill. If using gas, allow the burners to run for several minutes to remove leftover flavors and bring the surface to temperature.
While grill is preheating, make corn salad: cut fresh kernels off the corn and place into a bowl. Drag the back of a knife across the corn cobs to remove the milk and add that to the bowl as well. Stir in the squash, cilantro, lime juice, Jalapeño, green onion, salt, pepper and olive oil. Taste and adjust seasonings to your liking. Store in refrigerator.: When you cut the corn from the cob, the room fills with a sweet, vegetal aroma and the kernels glisten. Use a sharp knife and steady hand to shear the kernels off, and as you scrape the cob you will notice a creamy residue, which I always add to the bowl for extra corn flavor. Combining the diced yellow squash , chopped cilantro , fresh lime juice, finely diced jalapeño , and chopped green onions creates layers of brightness and heat. Stir in salt , pepper , and a splash of olive oil to marry the components and coat each kernel. Taste and adjust, because balance is everything here. A pitfall is overseasoning early, so I reserve some salt until after the salad chills, when flavors meld and you can accurately judge seasoning.
Grill hot dogs to your liking and add to soft buns. Top with corn salad and serve immediately.: As you slice, pay attention to the visual cue of full, plump kernels detaching cleanly from the cob. The sound is a soft scraping, and the bowl will begin to look glossy as the kernels release liquid. Keep the kernels roughly uniform in size so the salad eats consistently. If you slice too close to the core you may pick up tough bits, which can create an unpleasant texture, so aim for the sweet tender portion of the ear.
Drag the back of a knife across the corn cobs to remove the milk and add that to the bowl as well: This faintly creamy milky liquid carries concentrated corn perfume, and adding it deepens the salad's sweetness. Use the dull edge carefully; the motion is a scraping that draws out flavor, with the added liquid visibly pooling among the kernels. Be cautious not to gouge into the woody core, which can introduce fibrous bits. Missing this small step means you lose a subtle but important layer of corn intensity.
Stir in the squash cilantro lime juice jalapeño green onion salt pepper and olive oil: As you fold these in, the bowl will shimmer and tiny green flecks of cilantro will distribute, adding visual contrast. The lime juice brightens and the olive oil gives a silky mouthfeel that helps the salad cling to the franks. Mixing gently protects the shape of the kernels and prevents the squash from becoming mushy. Overmixing is a common mistake that breaks down texture, so combine until everything is evenly coated but still distinct.
Taste and adjust seasonings to your liking: This step is all about balance, and your palate is the best guide. A squeeze more lime will lift the salad, while a pinch more salt can sharpen sweetness. Sample on a spoon or a small piece of bun to understand how the salad will play with the frank. Avoid the trap of assuming your first taste is final, because refrigeration can mellow sharp notes and you may need a small adjustment before serving.
Store in refrigerator: Chilling lets the flavors marry and the textures settle, resulting in a more cohesive topping. The salad will cool quickly and the aroma will tighten into a unified profile, which is why I sometimes make it ahead. Cover it to prevent fridge odors from seeping in, and be mindful that leaving it too long can cause the yellow squash to soften beyond desirable texture. If you plan to keep it more than two days, freshen it with a little extra lime and a pinch of salt before serving.
Grill hot dogs to your liking: Place the all beef franks on the hot grate and listen for a clear sizzle as the exterior heats. Rotate them to get even char marks and a slight snap when bitten; this caramelization lends depth and a crisp edge. Watch closely to avoid flare ups which can char unevenly, and resist pressing the franks which squeezes out juices. The right visual cue is a golden brown with darker grill lines, not a uniformly black surface.
Add to soft buns: Lightly toasting the inside of the buns on the grill creates a warm, slightly crisp surface that resists sogginess when the corn salad is added. The scent of toasted bread is comforting, and the contrast in texture is immediate. Do not overtoast to the point of dryness, as this can distract from the salad's fresh qualities. Buttering the buns is optional, but a thin layer can add richness without overpowering the topping.
Top with corn salad and serve immediately: Spoon the chilled corn salad over the grilled frank so each bite carries both smoky and bright flavors. The visual is colorful and inviting, with yellow kernels, green cilantro, and flecks of jalapeño. Serve right away to preserve the salad's crispness; leaving the assembled sandwich too long will let moisture soften the bun and dull textures. A final check for seasoning right before serving ensures the balance is spot on.