The chef at the New Orleans School of Cooking said there are two trinities. The Divine one we knew, and the other, he said, gives a divine flavour and is found in many of the world’s favourite dishes. It is a combination of onion, celery, and sweet pepper. Add tomato and oregano and it is Italian. Add chili and tomato for Spanish or Mexican. Add curry for Indian. Add cream for French. By making a blender puree of those four vegetables, and then canning it, I use up a lot of end-of-the-season garden produce and have a head start on many sauces. The kids don’t pick out the chunks.