Risotto Primavera with arborio

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[...]

1/2 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[...]

6 cups hot chicken broth (you might need a bit more) 2 tablespoons butter 1 tablespoon olive oil 1 medium onion , finely chopped 3 tablespoons minced fresh[...]