Zucchini, Fennel & White Bean Pasta
1 large fennel bulb, trimmed2 medium zucchini3 tablespoons extra-virgin olive oil, divided¼ teaspoon salt8 ounces (2 cups) whole-wheat penne or similar short pasta2 cloves garlic, finely chopped1 cup cooked cannellini beans, plus 1/2 cup bean-cooking liquid, pasta-cooking liquid or water...