1. Wash the limes thoroughly, zest about 1 tsp from each, then cut them in half and squeeze out the juice. Clean the blueberries as well. Combine everything with the gelling sugar in a pot and bring to a boil while stirring. Let it simmer lightly for about 4 minutes, stirring constantly.
2. To test the gelling ability, place 1 tsp of the jam on a cold plate. If the jam firms up after about 1 minute, you can proceed. If not, extend the cooking time by 1-2 minutes and repeat the gelling test.
3. Gently skim off any foam with a spoon. Pour the hot blueberry-lime jam into clean jars. Seal the jars and let them cool upside down. Enjoy!
Nutrition per serving
kcal: 170
Protein: 0 g · Fett/Fat: 0 g · Carbs: 43 g
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