Red Onions with Coriander

• 1 cup [100 g] thinly sliced red onion
• 1 Tbsp fresh cilantro leaves

Put the onions and cilantro in a clean 1 pt [480 ml] canning jar with a tight-fitting lid.

In a small, dry cast-iron or stainless-steel skillet, toast the coriander seeds over medium-high hea