Sometimes I will make a recipe that calls for lemon zest but not lemon juice, like the incredible roasted chicken from last week. When this is the case, instead of chucking the "naked" lemons in the fridge where they will inevitably be forgotten and go bad, i juice them right after I'm done zesting them. I portion the juice into an ice-cube tray putting 1 tablespoon of juice in each cube, then freeze. When I need lemon juice for baking, salad dressing, or cooking I don't even need to measure - I just pop out as many cubes as I need. This juice tastes MUCH better than bottled juice and I don't always have to keep fresh lemons on hand.