Combine tomatoes, 1 tsp of oil, pinch of salt and pinch of pepper in a bowl and set aside.
By hand or gently pulse in a Magic Bullet rinsed black beans, boiling water, lime juice, and zest and 1 tsp of salt to a coarse puree leaving some whole beans intact.
Adjust oven rack 4 inches from broiler element and heat broiler. Place sliced bread on a lined baking sheet and broil until golden brown. 1-2 minutes per side.
Spread bean mixture evenly on toast, then top with avocado, pickled onions, cherry tomatoes, cilantro and salt to taste and serve.