Easy Vegan Fish Tacos

Name: Easy Vegan Fish Tacos
Ingredients: ½ cup vegan mayonnaise; 3 tablespoons apple cider vinegar; ¼ teaspoon black pepper; ¼ teaspoon salt; ⅛ teaspoon garlic powder; 3 tablespoons vegan butter; ¼ teaspoon garlic powder; 3 tablespoons white wine or cooking wine (or sub 1 tablespoon fresh lemon juice, plus more to taste); ¼ teaspoon onion powder; 2 14-ounce cans hearts of palm (drained and roughly chopped into bite-sized pieces); ⅛ teaspoon salt; a few dashes of black pepper; ¼ teaspoon dill (dried or ½ teaspoon fresh); 12 small corn tortillas* (see note below); 2 cups green cabbage (shredded); 1 avocado (thinly sliced); vinegary hot sauce (to serve (optional))