I use a 10cm deep saucepan with a glass lid instead of a tray. Wipe the pan with a paper towel. Add butter and once melted stir in onion, carrots and celery. Cook until golden and then add the wine. Let the wine evaporate. Add tomatoes cut into cubes, chopped garlic, oregano, thyme, bay leaf, chicken stock, a pinch of sugar and pepper. Bring to a boil. Season with salt and black pepper.