Place the tomatoes, cut side up, on a roasting tray and sprinkle with salt and sugar.
1.4 kg ripe plum tomatoes, 20 grams caster sugar, 2 teaspoons flaky sea salt
Roast the tomatoes in the oven for 20 minutes.
Place them briefly under the broiler to char them, then set to one side.
In a large pot, brown the pancetta, then add the chopped onions, celery, carrot and garlic. Cook until softened.
Vegetable oil, 200 grams pancetta, 2 Spanish onions, 2 celery sticks, 2 carrots, 4 garlic cloves
Stir in the sugar, dried oregano, bay leaves, red wine and red wine vinegar.
100 grams demerara sugar, 2 tablespoons dried oregano, 4 bay leaves, 200 ml red wine, 100 ml red wine vinegar
Bring to a boil then simmer to reduce by half.
Add the roasted beef, spice bag, tomatoes, mushrooms and stock and bring back to a boil. Cook gently, at aa very low simmer, for 90 minutes. Stir occasionally.
300 grams button mushrooms, 600 ml beef stock
Stir in the fresh oregano and sage and season to taste.
4 tablespoons finely chopped fresh oregano, 2 tablespoons finely chopped fresh sage
Remove the spice bag and take off the heat. You can keep this ragu in the fridge overnight.