Delta Shrimp

2 quarts water
1/2 large lemon, sliced
2 1/2 pounds unpeeled large fresh shrimp
1 cup vegetable oil
2 tablespoons hot sauce
1 1/2 teaspoons olive oil
1 1/2 teaspoons minced garlic
1 teaspoon minced fresh parsley
3/4 teaspoon salt
3/4 teaspoon Old Bay