Fill a pot with about 2 inches of water and bring to a boil.

While the water is heating, prepare the artichokes by rinsing them under cold water.

Cut off the stems so the artichokes can sit flat, and snip off the sharp tips of the leaves with kitchen shears.

Slice about 3/4 inch off the top of each artichoke and rub the cut surfaces with one half of the lemon to prevent browning.

Place a steamer basket in the pot and arrange the artichokes in the basket, stem side down.

Squeeze the remaining lemon half over the artichokes and drop the lemon into the water.

Cover the pot and steam the artichokes for about 30-40 minutes, or until the outer leaves can easily be pulled off.

Carefully remove the artichokes from the steamer basket and let them cool slightly before serving.