Orange Fennel Seared Tuna Salad

Name: Orange Fennel Seared Tuna Salad
Ingredients: 1 tablespoon fennel seed; 1 whole star anise; 1 tablespoon whole black peppercorns; 4 teaspoons dried orange peel; 2 teaspoons ground ginger; Pinch of ground cloves; 1/4 teaspoon ground cumin; 1 1/2 teaspoons coarse salt; 2 teaspoons sugar; 1 1/4 pounds tuna steak; Juice of 1 orange; 1 tablespoon white-wine vinegar; 1/4 teaspoon freshly ground black pepper; 2 tablespoons plus 1 teaspoon extra-virgin olive oil; 1 head red-leaf lettuce, torn into bite-size pieces; 1 cucumber, cut into 1/2-inch-thick rounds; 1/2 medium red onion, cut into thin moons; 1/2 pint cherry tomatoes, cut in half; 3 ounces feta cheese, for garnish