Braised Lamb With Pickled Onions

Name: Braised Lamb With Pickled Onions
Ingredients: One 5-pound boneless lamb shoulder, tied; 6 1/2 cups water; 3 bell peppers—1 red, 1 yellow and 1 green, cut into 1/2-inch dice; 2 large white onions, 1 cut into 1/2-inch dice and 1 thinly sliced lengthwise; One 14 1/2-ounce can diced tomatoes, juices reserved; Kosher salt and freshly ground pepper; 4 whole cloves; 2 teaspoons coriander seeds; Two 3-inch cinnamon sticks; 1/2 cup distilled white vinegar; 1 teaspoon sugar; 1 pound masa harina (4 cups); 3/4 cup pure olive oil; 1/2 cup cilantro leaves