In a large mixing bowl, combine ground beef, minced garlic, finely chopped onions, breadcrumbs, baking soda, chopped herbs, olive oil, salt, and pepper. Mix well and refrigerate for 2 hours.

Preheat your oven to 425°F (220°C). Shape the meat mixture into 1 to 1.5 inch meatballs and place on a parchment-lined baking sheet. Bake for 30-40 minutes or until cooked through.

Wash and cut potatoes into wedges. Toss with olive oil, salt, cumin, paprika, and oregano. Spread on a baking sheet and roast in the oven for 40-60 minutes.

In a medium bowl, combine Greek yogurt, grated cucumber, minced garlic, lemon juice, chopped dill (or mint), olive oil, and salt and pepper. Mix until smooth and refrigerate.

Layer lettuce, tomatoes, cucumbers, and red onions on a plate. Add roasted potatoes and meatballs, then drizzle with tzatziki sauce and garnish with fresh herbs.