Mexican Fish Tacos

Name: Mexican Fish Tacos
Prep time: 1 h 30 min
Total time: 1 h 30 min
Cuisine: Latin American, American, Mexican
Ingredients: 8-10 corn tortillas; 2 white fish fillet, no skin, already despined*; 6-8 peeled and deveined shrimp (optional); 1 cup (120g) all-purpose flour; 1 egg; 1 tsp of baking powder (optional); ½ cup (120ml) beer of your choice (room temperature); salt (or garlic salt) and pepper to taste; frying oil (enough to deep fry your fish, amount varies depending on pan size); 1 purple cabbage; 2 limes or 1 lemon; 1/4 red onion; 1 habanero pepper or any other fresh spicy pepper of your choice; 2 oz (60 ml) of white vinegar; 3 limes; salt & pepper to taste; 2 ripe tomatoes; 1 jalapeño (optional); 1/2 white or red onion; 1 bunch of cilantro; 1/2 cucumber; 2 lemons or 4 limes; 2 serrano peppers or jalapeño (optional); 1 cup (240ml) of water; 1 avocado; 1-2 hot peppers (dry or fresh); 1 spoon of sour cream; 1 spoon of mayonnaise; 1 teaspoon of mustard; 1 garlic clove