To make the kumquat juice, prepare the night before by placing the kumquats into the Thermomix bowl and chopping 6 sec/speed 6. Leave in the bowl overnight either in the fridge or on the kitchen bench.
In the morning, strain the kumquats through a fine nut milk bag, discarding the solids. Rinse out the Thermomix bowl and return 220g of the juice to the bowl. Store any remainder in the fridge and use in cocktails, drinks, cordials etc.
Add remaining ingredients to the juice in the Thermomix bowl and chop 5 sec/speed 7.
Cook 10 min/80°C/speed 4.
Cook 2 min/90°C/speed 5.
Store in sterilised airtight jar or container in the fridge until use.