Start the chili. Heat a medium pot with a heavy base or a Dutch oven over medium-high heat. Add the chorizo, beef, onions, salt and a pinch of pepper. Use a wooden spoon or potato masher to break the chorizo down into bits like the ground beef. Once the chorizo is mostly cooked and the onions are tender, add the garlic, chili powder, chili flakes, thyme and cinnamon. Cook a few minutes while stirring to combine all the flavors.
Cover and finish. Add the crushed tomato and beef stock. Raise the heat until the pot boils, then lower to a low simmer and cover. Cook, stirring occasionally, for about 40 minutes. Serve with a toppings/pairings bar. Transfer to a slow cooker if for a party.