- 3 red onions, thinly sliced
- 4 dl/1.6 cups apple cider vinegar
- 1 dl/0.4 cups sugar
- ½ tbsp salt
- pinch of crushed rainbow peppercorns
Finely slice your red onions and place them in a big bowl. In a kettle, boil enough water to cover them. Pour the hot water over the red onions and let sit for about 10-15 seconds before draining. Place the drained onions in a glass jar.
In a small pan mix, apple cider vinegar, sugar, salt and crushed rainbow peppercorns. Bring to a simmer and let cook until sugar and salt has dissolved.
Pour the hot vinegar mixture into your glass jar with onions and let sit without a lid until it has cooled down. Once cool, cover with a lid and place in the fridge.
The onions will keep fresh in the fridge for up to two weeks.