1 small red onion very thinly sliced
1 jalapeño also very thinly sliced
juice of 6 limes
3 tablespoons apple cider vinegar
2 teaspoons salt
1 teaspoon sugar
Squeeze the limes into an airtight container or jar. Add the vinegar, salt and sugar. Give it a quick stir. Add the onions and jalapeño and mix it well with the lime juice liquid. Place the lid on the container and let the onions marinate for a few hours before you add them to your favorite Mexican dishes.
These are especially delicious on tacos!