Can yuou make tomato sauce in a slow cooker?

I mean the proper, long-keeping type, cooked with vinegar. I've an urge to make some & thought to try using my slow cooker. I can't find any recipes though, only recipes for the "instant eat" type sauces. Any help much appreciated

I'm keen for some recipes as well, anyone have one that dosen't have apples though, as I'm allergic to them!

this probably isnt what you are looking for but its the closest i can find no apples either lol

# 1 (28oz) can tomato puree (or two 410gm ((ish)) tom puree)
# 1 small onion, chopped
# 1 medium shallot, chopped
# 1/2 cup cider vinegar
# 1/4 cup firmly packed light or dark brown sugar
# 1/2 tsp dry mustard
# 1/4 tsp ground allspice
# 1/4 tsp ground cinnamon
# 1/4 tsp ground mace
# 1/4 tsp ground ginger
# 1/4 tsp ground cloves
# 1/4 tsp ground red pepper flakes
# sea salt, to taste
# black pepper, to taste

*In a food processor, combine the tomato puree, onion, and shallot, and process just until smooth.
* Add the vinegar, brown sugar, mustard, allspice, cinnamon, mace, ginger, cloves, and pepper flakes, and pulse to combine.
* Pour into the slow cooker. Cover and cook on HIGH for 2 to 2 1/2 hours, stirring occasionally.
* Remove the lid and continue to cook the ketchup on HIGH, stirring a few times, until the mixture has thickened to the desired consistency, 30 minutes to 1 hour. You want it to be able to plop off a spoon.
* Season with salt and pepper.
* Turn off the cooker and let the ketchup cool to room temperature in the crock.
* Scrape with a spatula into a spring-top glass jar.
* Store, covered, in the fridge for up to 2 months.