Tamarillo ketchup goes well with barbecued meat.
Instructions
Wash and then blanch tamarilloes in boiling water that has been removed from heat for 4 minutes. Halve lengthwise, de-seed and coarsely chop.
Add the tamarilloes, sugar and vinegar to a large pan and bring to the boil. Simmer and cook for two hours.
Stir-in the spices, allow to cook for five minutes then ladle into warmed jars or bottles. Allow at least 1/4 inch headspace and seal the jars properly. Allow to cool then label and store.
The catsup should be allowed to mellow for a few weeks before using and unopened the jars should keep for at least a year if stored in a cool place.
Notes
Test for setting by placing a tablespoon onto a cool saucer. When ready the sauce will form a skin on top and will generate ridges when pushed with the finger. If not ready boil for a further fifteen minutes and test again.
Source
Food in U.S.A.