Grilled Shrimp and Arugula Salad

easy-peel medium shrimp, peeled

olive oil

slices crusty Italian bread

large garlic clove, peeled

balsamic vinegar

finely grated fresh lemon peel

kosher salt

bunch arugula (about 3 oz.), washed and dried

medium tomatoes, cut into wedges and halved

Freshly ground black pepper