Mix all of the above in a big bowl. Decant it into a food processor and pulse 3 times for about 2 seconds each until the ingredients are very lightly broken up. Do this in batches (I did three).
Return the mixture to the bowl, cover with cling film and refrigerate for about 6 hours (I went a bit longer). Place the mix in a double muslin cloth, tie it with a string and suspend it over a bowl overnight. Do not squeeze the cloth; simply allow the liquid to drip out.
What you will end up with is a bowl full of slightly golden, clear liquid. This is the essence. A bit of the red from the tomato skin cells seeped through, but it settled at the
Notes
Store any leftover essence or soup in a sealed glass jar in the fridge.Use within 3 - 4 days. Freeze it if you wish to preserve it for longer.