In a small bowl, whisk together mayonnaise, sour cream, and sriracha sauce. Add water as needed to thin the sauce, then chill in the fridge.
Heat a heavy skillet over medium-high heat. Warm each corn tortilla for about 30 seconds on each side, then keep warm in aluminum foil.
In a medium bowl, coat the shrimp with cornstarch. Heat avocado oil in the skillet until nearly smoking. Cook shrimp for 2-3 minutes until pink and opaque, seasoning with salt, pepper, and minced garlic.
Assemble tacos by placing 3-4 shrimp on each tortilla. Top with chopped cabbage, radishes, and cilantro. Drizzle with the chilled sauce.
Serve immediately with lime wedges and optional jalapeño slices.
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Notes
Store leftover components separately to maintain freshness.