Part 3/7:
The first step in crafting your tomato sauce involves cooking the onions until they are soft and translucent. Patience is key, as this process typically takes 10-15 minutes over a low heat. During this cooking phase, a pinch of salt and a bit of pepper can be added to enhance flavor. For a richer sauce, consider including finely diced carrots or celery, known collectively as odori, which contribute aromatic depth.