Pizza with olive oil, herbs, summer squash, fennel, onion, apple, ricotta, and mozzarella.   It’s springtime in central Texas, and this year it just won’t stop raining! This incredible pizza is perfect for a stormy night in with a group of friends and a few bottles of crisp white wine. It features layers of flavor with a spotlight on a few of my favorite spring crops: fennel, patty pan squash, and tons of herbs. Caramelizing the fennel and onion yields a golden jammy spread with a…