"Fresh" sweet corn is readily available in the dc area. it is picked the day before sale at the latest. sweet corn rapidly looses sweetness as the sugars turn to starch. keep refrigerated to reduce the reaction. really fresh corn needs no more than 3 min of cooking in boiling water. there are lot of other ways to cook corn.

once cooked, the sugar stabilizes. cook all the corn, slice off the kernels with a big butcher knife, and store in the fridge. mix with black beans, and add a bit of vinegar for an alternate(tough to find a matching wine).