Lebanese Street Sandwiches

Directions

1. Place onions in a food processor; pulse until finely chopped. Remove and pat dry; transfer to a large bowl. Add parsley to processor; pulse until minced. Stir into onions. Add beef, egg and salt; mix lightly but thoroughly.
2. Slice pitas horizontally in half. Spread bottoms with meat mixture to edge. Replace pita tops; press lightly to adhere. Brush outsides of sandwiches with oil. Grill sandwiches, uncovered, over medium heat until a thermometer inserted into meat mixture reads 160°, 10-12 minutes, turning every 2 minutes. Cool slightly before cutting into quarters.
3. Combine sauce ingredients; serve with sandwiches.