To test an avocado for ripeness, gently squeeze it. It should yield slightly to gentle pressure.
Use a small sharp knife to score the avocado from top to bottom. Gently pull apart the two halves and pop out the plum-sized pit with a spoon.
Rub the cut surface with lemon or lime juice to prevent discoloration.
Scrape out the flesh with a metal spoon -- a serrated-edge grapefruit spoon works well.
