An easy tip to get corn off the cob - put a small plastic bowl upside-down inside a larger bowl. Put the corn vertically on top of the small bowl and cut off the corn with a knife. The corn will fall inside the bigger bowl, preventing corn from flying all over the kitchen. Best made with fresh corn, but you can use frozen corn when fresh isn't available.
Epazote is an herb or weed. It can be hard to find fresh; if you do, use 1 tablespoon chopped in this recipe. Dried is found in most grocery stores with other dried Mexican herbs. If you can't find it near you, you can omit it and the corn is still delicious.
Do-ahead tip - you can prepare corn through step 2. When ready to serve, bring to room temperature (not hot), in the microwave and proceed with finishing the dish.