Instructions

1. Combine all ingredients except for oil in a blender.
2. Blend on high for about 30-45 seconds. Use blender auguer to press tomatoes into blender blade to get the puree going.
3. Drop blender speed down to medium-low, and start to slowly stream in canola oil, forming an emulsion.
4. As the vierge starts to thicken, slowly work the blender speed up to the highest setting.
5. When the hole in the vortex formed by the blender shrinks to the size of a nickel, shut off the blender blade. You should see one or two large air bubbles break the surface of the emulsion. If a bunch of tiny air bubbles break the surface instead, then your emulsion is broken and you'll need to start over.
6. Taste vierge for balance and flavor; sometimes the sauce will taste a little sour from acid present in the tomatoes and sherry vinegar. A small pinch of sugar will counteract this, although usually salt and freshly ground pepper are all you'll need to add.
7. Push finished vierge through a chinois and chill in an airtight container. Keeps for up to five days.