PREPARATION
Step 1
Add the yogurt, feta and lemon juice to the bowl of a food processor. Purée the mixture until smooth, about 2 minutes. Add the parsley, mint, scallions and sumac, and pulse a few times just to combine.
Step 2
Transfer the dip to a bowl, cover and refrigerate for at least 1 hour before serving.
Step 3
Just before serving, give the dip a good stir and add salt to taste, if necessary. Top the dip with a drizzle of olive oil and sprinkle with additional parsley, mint, scallions and sumac. Serve with pita chips or crudités. Store leftovers, covered, in the fridge for up to 3 days.
https://cooking.nytimes.com/recipes/1021247-herby-feta-and-yogurt-dip-with-sumac?q=herby%20feta#notes_section