A note about avocados: Sometimes you are lucky enough to find them ripe at the store. A ripe avocado will give to slight pressure. It shouldn't feel mushy or very soft. The skin should be firm and the fruit should feel heavy fot its size. If you need to ripen your avocados, place them together in a paper bag on the countertop and leave them for a day or two. Now let's make some guacamole.
First, roll the lemon on the countertop and then squeeze the juice. You should have about 3 tablespoons. If you have more, you can freeze the juice in 1 tablespoon amounts for later use.