Wash the tomatoes, cut in half and leave to drain, cut sides down, in a colander for about an hour. Wash and stone the plums.
Put the garlic, tomatoes and plums in the Thermomix bowl and chop 30 seconds/Speed 7.
Add all the other ingredients. Cook 30 minutes/100° C/Speed 1, placing the simmering basket on top of the lid to allow steam to escape and to stop spattering. During this time, sterilise your bottles, caps or lids. Don't forget to sterilise your funnel as well.
Cook again 15 minutes/Varoma setting/Speed 2 to reduce and thicken your ketchup.
At the end of cooking take out the bay leaf and cloves if you can find them. Carefully taste (beware, it will be hot!) and add more salt if required. Blend 1 minute/Speed 8. (Notice Thermomix’s Soft Start safety feature as you blend a hot liquid.) Pour into sterilised bottles, cover with sterilised lids, label and store in the fridge.