Preheat oven to 350 degrees Fahrenheit (175 degrees Celsius).

In a food processor, pulse the onion, bread, parsley, cilantro, and garlic until finely chopped and fully combined. Transfer mixture to a large bowl with the ground meat. Add black pepper, chili powder, salt, and egg. Mix gently but thoroughly until evenly combined.

On a baking sheet, place the bottom halves of the slider buns without separating them. Spread the smoked baba ghanoush evenly over the buns, then layer the meat mixture on top, pressing lightly to form a

uniform layer. Top with the remaining slider bun tops.

Melt the margarine and stir in the za’atar. Brush generously over the tops of the buns.

Bake for 40 minutes, then reduce oven heat to 300 degrees Fahrenheit (150 degrees Celsius) and bake for an additional 10 minutes. Remove from the oven.

While the sliders rest, prepare the tzatziki sauce by mixing the julienned cucumbers, pareve sour cream, lemon zest and juice, chopped parsley, crushed garlic, and salt to taste.

Combine the tomato slices, red onion, olive oil, sumac, crushed garlic, and salt.

Once the sliders have cooled for about five minutes, carefully remove the top half of the buns. Spread the tzatziki sauce evenly over the meat, then layer the tomato salad on top. Replace the bun tops and cut into individual sliders.