Saute the onion in the olive oil until soft. While it is cooking, crush all the herbs and spices {except the red pepper) with mortar and pestle, and immediately add to the onion (at least 5 mins cooking time for the herbs etc). Stir in the garlic and crushed red pepper and saute for 1 minute longer.
Stir in the remaining ingredients, simmer over low heat for 30 – 45 minutes. Taste and adjust - add more salt if desired.
Can be put through the blender and strained for a smoother sauce (which allows use of chopped instead of crushed tomatoes and a rougher chop of the onion and garlic); it will be quite thin after straining.