Wild Mint and Kishk Salad (Méekeh)

1. 1 medium onion
2. 1 ½ cups (50 g) wild mint
3. ¼  cup kishk

For the dressing

1. ¾  cup olive oil
2. 1 ½  tsp salt

For the garnish

1. ¼  cup chopped tomatoes
2. ¼  cup kishk