Source: vernscheese.com

1 tablespoon vegetable oil
8 ounces sliced mushrooms
1 bulb anise or fennel, trimmed and thinly sliced
1 medium onion, thinly sliced
1 clove garlic, finely minced
Salt and pepper to taste
1 (10-inch) prepared pizza crust
1/2 cup pizza sauce
1/2 pound peeled, de-veined and cooked shrimp
2 cups (8 ounces) shredded Wisconsin-Style Havarti