- 1 dried ancho or guajillo chile, seeded and torn into pieces
- 1/2 cup warm water
- 1/4 cup fresh cilantro
- 3 garlic cloves
- 1 tablespoon fresh lime juice
- Pinch of sugar
- 1 1/2 teaspoons kosher salt
- 1 stick (1/2 cup) unsalted butter, softened
- 8 ears corn, shucked
- Soak chile in warm water in a 1-cup glass measure until softened, about 30 minutes, then drain.
- Finely chop cilantro and garlic together in a food processor. Add chile, lime juice, sugar, and salt, then process until finely chopped. Add butter and blend until smooth, then spoon into a ramekin.
- Cook corn in a large pot of boiling salted water until crisp-tender, 4 to 5 minutes. Transfer with tongs to a platter and serve with butter.