Blend or purée the bell pepper, chilis, garlic cloves, 3 tablespoons of oilve oil, rice vinegar, 1 teaspoon paprika, and 1/2 teaspoon of salt until very smooth. Taste and adjust seasoning if needed. Transfer to a small bowl.
Place a rack in the upper third of the oven and heat to 450°F.
In a bowl, mix 2 tablespoons of the piri piri sauce with the egg yolks, garlic, salt, cumin, paprika. Use your hands to mix throughly and gently into the ground pork. Shape into 2 inch balls and space evenly on a lightly oiled foil lined rimmed baking sheet.
Bake for 10 minutes then turn the oven on to broil and broil until just golden brown and cooked through, 5-6 minutes.
Spread the yogurt or sour cream out onto the serving plate and arrange the meatballs on top, drizzling with the piri piri sauce and oil. Enjoy!