Cut the stems of the artichokes. Cut about 1 inch (3 cm) off the top of the artichokes.
Snip off the thorns on the tip of the artichoke petals with sissors.
Remove the center of the artichokes with a knife and two tablespoons. Rub lemon juice over the cut portion of the artichoke to prevent it from browning.
Cook the artichokes in boiling water during 30 minutes. Then, put the cooked artichokes on a parchment paper and preheat the oven to 350°F (180°C).