1. Stand the artichokes in a microwaveable baking dish, squirt them with lemon juice, and add 3 inches of water.
2. Cover tightly with plastic wrap and microwave on high for 4 minutes.
3. Turn the dish around halfway, and microwave on high again, for another 4 minutes. If they are not tender yet, turn the dish halfway again and repeat at 1-minute intervals until you can pierce the bottoms easily with a paring knife.