1/3 c. mayonnaise
1 1/2 tsp. sriracha
3/4 tsp. fresh lime juice
1/2 tsp. Old Bay seasoning, plus more for serving
FOR SHRIMP FILLING
1 tbsp. extra-virgin olive oil
1 lb. smal shrimp, peeled and deveined, tails removed
1/2 yellow onion, finely chopped
1 small green bell pepper, diced
2 cloves garlic, thinly sliced
1/4 tsp. ground cumin
1/4 tsp. paprika
FOR ASSEMBLING BURRITO
4 large flour tortillas, warmed
1 c. cooked long-grain white rice
1 c. cooked black beans, rinsed and drained
3/4 c. shredded Mexican cheese
1 c. shredded lettuce
1 c. pico de gallo, drained
1 avocado, thinly sliced
2 tbsp. chopped chives, plus more for serving