Roasted Leg of Lamb with Mint and Cucumber Yogurt

Name: Roasted Leg of Lamb with Mint and Cucumber Yogurt
Ingredients: 6 shallots, minced to yield about 3/4 cup; 4 cloves garlic, minced; 1/4 cup chopped fresh rosemary; 2 tablespoons sugar; 2 tablespoons cracked coriander seeds; 1 1/2 tablespoons salt; 1 tablespoon red chile flakes; 1 (6 pound) bone-in leg of lamb; 2 cups vegetable or chicken stock; Tzatziki Sauce, recipe follows; 2 cups plain yogurt; Juice of 2 lemons; 1 cucumber, peeled and diced; 3 tablespoons chopped fresh mint; 1 tablespoon minced garlic; 1 tablespoon minced shallots