2 ripe avocados, peeled and cut into 1/2" cubes
3 T lime juice
1 ripe mango, peeled and cut into 1/2" cubes
1 jalapeño, seeded and minced
1 t grated lime zest
1/2 t salt
1/4 t sugar (or agave nectar)
2 T chopped cilantro, plus more for garnish
4 T olive oil
1 15.5-oz can black beans, drained and rinsed
black pepper, to taste