1 (15 ounce) can of black beans, rinsed and drained (or 1 1/2 cups of freshly cooked black beans)
1 1/2 cups frozen corn, defrosted (or fresh corn, parboiled, drained and cooled, or grilled and cooled)
1/2 cup chopped green onions (including onion greens) or shallots
1/2 fresh jalapeño pepper, seeded and minced, or 1/2 pickled jalapeño pepper, minced (not seeded)
3 fresh plum tomatoes, seeded and chopped and/or 1 red bell pepper, seeded and chopped
1 avocado, peeled, seeded, and cut into chunks
1/2 cup chopped fresh cilantro
2 Tbsp lime juice (about the amount of juice from one lime)
1 Tbsp olive oil
1/2 to 1 teaspoon of sugar (to taste)
Salt and pepper to taste