Place the shrimp in a large bowl and set aside.: The neutral coolness of the bowl contrasts with the warm pan later, making prep calm and organized. You'll notice the shrimp feel firm and slightly slick; patting them lightly with a paper towel can remove excess moisture so they sear rather than steam. This step matters because dry surfaces brown better and develop more flavor. A typical error is skipping this and ending up with pale, steamed shrimp instead of a glossy sear.
In a smaller bowl, mix together the chili powder, cumin, oregano, 1 teaspoon of the salt, pepper, and red pepper flakes to taste. Add to shrimp and toss to combine. Let the shrimp 'marinate' as you prepare the other ingredients.: The spice blend should smell aromatic and earthy when combined, with the cumin standing out as warm and slightly nutty. Mixing the spices first lets them distribute evenly over the shrimp , ensuring each bite has balanced flavor. Rushing this step can create clumps of spice on some pieces and blandness on others, so whisk thoroughly until the powders are uniform.
In a large saute pan, heat 2 tablespoons of the olive oil. Add the peppers, onions, garlic, remaining salt, and cook until vegetables are tender. Remove to another bowl and toss with the juice of half a lime.: As the spices coat the shrimp , you'll see a light dusting of rust colored seasoning. Marinating briefly allows salt to start drawing flavors inward, and the aromatics to adhere. While you chop the peppers and onion, the spice will become more pronounced on the surface. Avoid marinating too long with citrus or salt heavy blends, or the texture can begin to firm up excessively.
Add another tablespoon of oil to the pan and cook the shrimp just until they turn pink, about a minute on each side. Remove to the bowl with the vegetables as soon as they're cooked.: The oil should shimmer but not smoke, which signals the ideal temperature for sautéing. You want it hot enough to produce a quick sizzle when the vegetables hit the pan, that sizzling sound indicates moisture evaporating and edges caramelizing. If the oil smokes, remove the pan from heat briefly to cool, because burnt oil imparts bitter notes.
Toss together the vegetables and the shrimp. Taste and add more seasonings as desired. Top with minced cilantro and serve with flour tortillas.: Toss the sliced peppers and onion into the hot oil and listen for a lively sizzle. As they cook, you will smell a sweet, savory aroma and see edges soften and gain charred flecks. Stir occasionally until pieces are tender crisp to your liking; this preserves a bit of bite that contrasts with the shrimp . A common mistake is overcrowding the pan, which causes steaming instead of searing, leading to limp, pale vegetables.
Serve in tortillas.: The warm vegetables will soak up the lively citrus and release a bright perfume. Tossing them while warm helps the lime juice meld with the pan oils and spices, coating each strip. This acidic touch balances the heat and oil, preventing the dish from tasting flat. If you add too much lime, the vegetables can become soggy, so use the measured half lime and adjust at the table if needed.
Add another tablespoon of oil to the pan and cook the shrimp just until they turn pink, about a minute on each side: When the pan is hot again, the shrimp should sizzle as they hit the surface, quickly changing from translucent to opaque with bright pink edges. You'll hear a quick popping sound and see the spice caramelize slightly. Cook briefly to maintain a tender interior, because overcooking makes shrimp tough. A frequent error is leaving them in too long, so watch closely and flip once.
Remove to the bowl with the vegetables as soon as they're cooked: The contrast of the hot, seasoned shrimp hitting the warm vegetables releases an inviting steam and mixes aromas. Combining them off heat prevents the shrimp from carrying on cooking in the residual pan heat, which helps preserve juiciness. Leaving them in the pan risks overcooking while you finish other tasks.
Toss together the vegetables and the shrimp, taste and add more seasonings as desired: When you toss, notice how the glossy oil and lime cling to the surfaces, and how the spices have attached to each piece. Tasting at this point allows you to correct salt, heat, or acidity so the flavors sing in harmony. If it tastes flat, a pinch more salt or a squeeze more lime brightens the dish; avoid dumping extra spices without tasting, which can throw off balance.
Top with minced cilantro and serve with flour tortillas: Finely minced cilantro adds a fresh, herbaceous lift when scattered over the warm mixture. Serve immediately with warmed flour tortillas to preserve the contrast of textures. If you wait too long to serve, the vegetables will cool and lose some of their vibrancy, so plan plating to coincide with finishing the last steps.
Serve in tortillas: The final assembly is tactile and fun, with warm flour tortillas wrapping the spiced shrimp and charred peppers. You'll hear the soft rustle of the tortilla and feel the warmth as you fold it over the filling. Encourage guests to add extra lime or red pepper flakes to their preference. A common mistake is overfilling the tortilla, which makes eating messy and detracts from the balance of flavors.