1 ripe avocado, peeled, pitted, etc. (you can tell when they’re ripe if they are firm with no soft spots but not hard like a basketball.)
1/4 of a lemon’s juice
1/4 cup finely minced onion
1/2 teaspoon salt
Smash avocado flesh with a fork in a shallow bowl, squeeze the lemon into the mash, add onion, salt, and stir well.