Braised Collard Rolls with Lamb and Quinoa

Name: Braised Collard Rolls with Lamb and Quinoa
Ingredients: 12 large unbroken collard leaves, washed; 3/4 cup quinoa, thoroughly rinsed; 3 tablespoons olive oil, divided; 1 teaspoon whole cumin seeds; 1/2 teaspoon whole fennel seeds; 1/2 teaspoon ground cinnamon; 1/2 teaspoon ground coriander; 1/4 teaspoon crushed red chili flakes, or to taste; 1 large yellow onion, half finely diced, half sliced; 4 large garlic cloves, minced; 1 pound ground lamb; 1/4 cup chopped fresh mint; 1 large egg; 1 cup tomato sauce; 1 quart chicken stock, or as needed; Salt and freshly ground black pepper to taste