Vegan Fish Tacos

Name: Vegan Fish Tacos
Cuisine: Mexican
Ingredients: 290 g banana blossoms ((that's one 510g can)); 4 g kombu ((or any other kelp)); 1 tsp old bay seasoning; 360 ml water; 1/8 tsp fine sea salt; 1 red onion; juice of 1.5 limes; 90 g vegan mayonnaise; 20 ml soy milk; 1/2 tsp apple cider vinegar; 1/4 tsp garlic powder; 1/2 tsp lime zest; 2 tsp lime juice; 1/2 tsp sriracha hot sauce; 100 g white cabbage ((shredded finely with a mandolin or vegetable peeler)); 1 tbsp vegan mayonnaise; 1/2 tsp lime juice; salt and pepper to taste; 3 radishes ((finely sliced)); 200 g plain white flour; 1.5 tsp baking powder; 275 ml beer ((make sure it's vegan)); vegetable oil for frying; 10 taco tortillas; 25 g fresh coriander; 1 avocado ((finely diced)); 2 tsp Tajin seasoning ((optional)); lime wedges for squeezing