Risotto Primavera with lemon

1 1/2 tablespoons olive oil 1 1/2 tablespoons unsalted butter 3 cups leeks , white and light green parts chopped (2 leeks) 1 cup fennel , chopped 1 1/2 cups[...]

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 lb thin asparagus , trimmed and cut into 1/2-inch pieces 2 medium carrots , scraped and diced into 1/4-inch pieces 2 large zucchini , diced into 1/4-inch[...]

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[...]