Cilantro Lime Tilapia Tacos

tilapia fillets, rinsed and pat dried

olive oil

small onion, chopped

garlic cloves, finely minced

jalapeño peppers, chopped (seeds removed for less heat)

diced tomatoes

fresh cilantro, chopped

lime juice

salt and pepper

5-inch white corn tortillas

medium haas avocado, sliced

lime wedges and cilantro for garnish