Kenji Slow-Cooked Bolognese Sauce Recipe

1. Adjust oven rack to lower-middle position and preheat oven to 300°F (150°C). Place stock in a medium bowl or 1-quart liquid measure and sprinkle with gelatin. Set aside. Purée tomatoes in the can using an immersion blender or transfer to the bowl of a countertop blender and purée until smooth. Tr