Black bean tortas with coconut chipotle mayo

Name: Black bean tortas with coconut chipotle mayo
Cook time: 30 min
Total time: 30 min
Cuisine: Mexican, Latin American, American
Ingredients: 1 cup canned coconut milk; 1/3 cup chipotle sauce; 1/4 cup olive oil; 1 tbsp lemon juice; 1/2 tsp garlic powder; Pinch of salt; 1 tsp oil; 1 brown onion; 3 cloves garlic; 1 tbsp Chili powder; 3/4 tsp ground cumin; 3 cups cooked black beans; 1 1/2 cups vegetable stock; Lime juice; Salt (to taste); 4 torta rolls (or equivalent); Lettuce; Sliced tomatoes; Sliced red onions; Sliced avacado