Juice the lemons and grapefruit. Combine the juice with sugar and stir until completely dissolved. Add the Samuel Adams Summer Ale to prevent too much foam from forming. Add the zests. Taste the mix and adjust the sweetness by adding 1 to 2 tablespoons more sugar if needed.
Use ice cube trays or 2-ounce paper cups as ice pop molds. Pour the mixture into your molsd. Cover with aluminim foil and poke tooth picks into the center of each one. The aluminum foil will prevent the stick from falling sideways. Allow to freeze overnight and enjoy.