In a large mixing bowl, combine meat and veggies. Add egg, breadcrumbs, and herbs. Season with salt and pepper.
Knead the mixture for 2-3 minutes. This keeps the texture light. It ensures flavors blend perfectly.
Shape the meat mixture into 1.5-inch balls.
Heat olive oil in a wide skillet. Sear the meatballs until they are browned on all sides.
Pour chicken broth into the skillet. The meatballs should be half-submerged. Cover and simmer for 20 minutes.
Whisk two eggs and lemon juice. Add cornstarch if you want a thicker sauce. Whisk until frothy.
Temper the egg mixture slowly. Whisk in two ladles of hot cooking broth from the skillet. This prevents curdling.
Pour the tempered egg-lemon mixture back into the skillet with the meatballs.
Shake the pan over low heat. Stir for 2-3 minutes. The sauce will become velvety. Do not let it boil.
Serve immediately. Garnish with additional fresh herbs.