Loaded Guacamole Vegetarian Tacos

Ingredients

for the guacamole:
2 avocados, pit and skin removed, roughly chopped
1/2 of a lime
1/2 of a lemon
1/4 salt (plus extra as needed)
1/3 cup corn kernels (raw, from about 1/2 of a large cob, or thawed from frozen)
1/4 cup red bell pepper, diced
2 tablespoons diced poblano pepper
1 tablespoon diced red onion
1 tablespoon diced jalapeño pepper
2 teaspoons minced cilantro
1 clove garlic, minced
for the black beans:
1 can black beans (15 ounces)
1/3 cup corn kerns (raw, from 1/2 of a large cob, or thawed from frozen)
1/4 cup red bell pepper, diced
1/4 cup poblano peppers, diced
1/2 teaspoon ground cumin
for the tacos:
6 small flour or soft corn tortillas
2 cups chopped iceberg or romaine lettuce
1 tablespoon minced cilantro
hot sauce, such as Cholula or Sriracha (optional)
lime and/or lemon wedges