Bruschetta with Lima Bean Salad and Lemon Shrimp

Name: Bruschetta with Lima Bean Salad and Lemon Shrimp
Ingredients: One 10-ounce package frozen baby lima beans; 1/3 cup finely chopped mint; 1/3 cup finely chopped parsley; 2 tablespoons white wine vinegar; 3 tablespoons extra-virgin olive oil; Salt and freshly ground pepper; Eight 1/2-inch-thick slices sourdough bread cut from a round loaf; 1 garlic clove; 4 tablespoons unsalted butter, softened; 1 teaspoon finely grated lemon zest; 8 jumbo shrimp—shelled, halved lengthwise and deveined