This traditional roasted pepper and feta spread resembles a Greek romesco. It goes well with just about anything and is wonderful on its own as a dipping agent for crudites or potato chips.
Brush the onion slices with a little olive oil and season with kosher salt and pepper. On a hot grill pan or in a cast-iron skillet, grill the onion until tender and slightly char-marked. Separate into rings.In a food processor, combine all the remaining ingredients and process until very smooth. Taste for seasoning but be careful not to add too much salt, as the feta is very salty.