Risotto with artichokes

1 lemon, halved 3 artichokes 1 pound slender asparagus 4 14 1/2-ounce cans (about) low-salt chicken broth 3 tablespoons olive oil 1 large onion, chopped 2[...]

1/2 each lemon 5 1/2 cups chicken broth approximately 3 tablespoons olive oil 1 large onion finely chopped 1 Stalk celery cut into pieces * 1 1/2 cups arborio[...]