I poured a little over a tablespoon for each cube and then after they were frozen, I put them in a freezer bag and labeled them. If I need less than a tablespoon for a recipe, I have a small lemon juice squeeze bottle unopened that I could use but I prefer the (organic) lemon juice without the additives.
I also plan on doing this with lime juice next!
*2 cubes or 2 tablespoons equals the juice from a whole lemon.