In a stand mixer fitted with a paddle attachment beat the butter until light and fluffy.
Add the beer, sriracha, garlic and salt. Beat until well combined.
Add the butter to a piece of plastic wrap, roll tightly into a log. Refrigerate until set, about 1 hour.
Preheat the grill.
Brush the corn with olive oil, sprinkle with salt and pepper.
Grill on all sides until lightly charred and tender, 8-10 minutes.
Add the corn to pieces of aluminum foil, top with several slices of butter, sprinkle with cilantro.