INGREDIENTS
1
small red onion, thinly sliced
2 tsp
coriander seeds
2 tsp
mustard seeds
1 tsp
cumin seeds
1 cup
cider vinegar
1 tbsp
sugar
Kosher salt
3
large tomatoes, sliced 1/2" thick
1
English cucumber, sliced
Olive oil, for serving
1/3 cup
fresh cilantro