Tuna and White Bean Salad

Name: Tuna and White Bean Salad
Ingredients: 1 garlic clove; 3 tablespoons fresh lemon juice; 3/4 teaspoon salt; 1/2 teaspoon black pepper; 1/4 cup extra-virgin olive oil; 1 (15- to 19-oz) can cannellini or other white beans, drained and rinsed; 1 (1-lb) seedless cucumber (usually plastic-wrapped), quartered lengthwise and cut crosswise into 1/3-inch-thick slices; 1 lb tomatoes (3 medium), cut into 1-inch pieces; 1 1/2 cups loosely packed fresh flat-leaf parsley leaves; 2 (6-oz) cans tuna packed in oil (preferably olive oil), drained