We tested this recipe with limes and lemons. You may substitute an equal amount of lemons and lemon juice.
Cut each lime into 1/4-inch-thick slices; cut each slice into 4 wedges.
Stir together 1 qt. cold water and 1/4 cup lime juice. Fill each compartment of 3 ice cube trays evenly with lime juice mixture. Place 1 lime wedge in each ice cube compartment. Freeze 8 hours or until firm.
Definitely a recipe worth trying!
I have tried this and I am pleased with it. Does anyone know something close to this with grapefruit -ice cubes?