Preheat your Dutch oven over medium-high heat and add the oil. Season the beef cheeks with salt and sear until browned. Set aside.Preheat the oven to 325-F.
Add the diced onion, carrots, and celery to the Dutch oven and season with salt. Saute until soft, then add the garlic, red pepper flakes, and tomato paste.
Tie the rosemary and thyme sprigs together, then add them, and the bay leaves to the pot.Cover and cook in the oven for 2.5-3 hours, stirring halfway through.