These amounts are only estimated as I really do not measure when making this salsa, start with amounts listed and adjust to taste. I most always use fresh cooked corn removed from the cob to make this, I find that it is much better than frozen or canned corn! Plan ahead the salsa needs to chill for a minimum of 4 hours before serving, don't even think about serving it right away, the flavor will intensify upon chilling! I use a whole small jalapeno pepper, as we like it very spicy, you might want to cut back on the jalapeno pepper slightly to suit taste. This is one of the best recipes for black bean and corn salsa, I make it all the time for my get togethers, everyone loves it and there is never any leftovers, it all goes! Servings is only estimated.