Cajun Shrimp Tacos with Mango Salsa

large shrimp (shells removed)

butter

cajun seasoning (or to taste)

juice from half a lemon

mango (peeled and chopped)

cherry tomatoes (chopped)

juice from 1 lime

green onions (chopped)

jalapeno (seeded and chopped)

cilantro (chopped)

salt and pepper

6" corn tortillas

coleslaw mix