Put all of the ingredients in to a food processor using the chopping attachment and chop them up. You can chop by hand, but a food processor will save you time.
Put all of the ingredients, including the chopped vegetables (except the pasta, rocket and parmesan), in your slow cooker bowl and cook on high for 4 hours or low for 6 hours.
Leave the sauce to cool and then pour it in to food processor in small batches and blend the sauce until smooth, or leave chunks if you prefer.
Mix half the sauce in to the cooked pasta and serve with rocket and shaved parmesan
Get creative and use a selection of different vegetables based on personal preference, season or what you have in the fridge.
You can use a stick blender, jug blender or food processor to blend this. If putting in a jug blender or food processor, make sure it is cooled first, as hot sauce can cause it to explode. You may need to blend it in batches, depending on how big your jug is.
If you don't want just vegetables, then top the dish with grilled chicken or salmon before serving.
This sauce would go well with rice or on a baked potato too.
If making this for kids, use reduced salt stock (or just water) and don't add any extra salt. There will be enough flavour from the vegetables, that it won't miss the salt.
If you don't need a lot of sauce, or don't want to freeze the leftovers, then you can halve this recipe.