Drain the black beans but make sure to reserve a little liquid.
Add black beans, garlic, tahini, olive oil, lemon juice, salt, cumin powder, and red pepper flakes to a blender or a food processor.
Process until combined, scraping down the sides of the blender as needed. Add 2-3 tablespoons of the reserved liquid from the beans, if desired, to make a looser dip. Check for salt and add more if needed.
Transfer to a bowl and garnish with red pepper flakes and drizzle some olive oil all over. Serve!