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What you need: Lemons, a countertop and knife.
What you do: Using a firm pressure, roll a lemon across your countertop a few times. Then cut it in half and hold one piece upside down so that the fleshy part of the citrus is in your palm. Squeeze. Repeat with the other piece.
Why it works: Rolling helps to break down cell walls (which releases more juice), while your grip ensures that you catch all of the seeds in your palm while squeezing.