Black Bean Avocado Toast

1 Slice the onions and leave it in vinegar for few hours 
2 Mash the black beans
3 In a pan on medium heat, add oil, black beans, tomato paste and taco seasoning and cook till it thickens
4 Toast slices of bread in an oven or toaster
5 Once toasted, remove it from oven 
6 Add black beans and shredded cheese on the toast 
7 Broil the toast for 5 minutes at 400 degrees Fahrenheit or till cheese completely melts
8 Remove the toast from oven, add some sliced pickled onions
9 Add avocado slices 
10 Top with more sliced pickled onions
11 Sprinkle black pepper and garnish with chopped cilantro