Preheat oven to 375 degrees Fahrenheit. Line a baking sheet with parchment paper and set aside.

In a bowl, mix onions with salt, pepper, cumin, and coriander. Add beef or chicken and mix well.

Working with one pastry square at a time, place about two tablespoons of the meat mixture in the center of the square.

Bringing two opposite corners together, form a triangle. Pinch together the ends of the pastry to seal.

Place samsa on the prepared baking sheet. Brush with egg and sprinkle with sesame seeds.

Bake 30 minutes or until golden.

In a bowl, combine all ingredients for dipping sauce. Serve with samsa.