How to Make It
Put the meat in a food processor and process until finely chopped. In a large bowl, mix the flour with the baking powder and salt. Add the chopped meat, onion, celery, garlic, thyme, pepper and eggs and mix with your hands until thoroughly blended. Form the mixture into 16 meatballs and flatten slightly.
In a large skillet, heat 1/4 inch of oil until shimmering. Add the meatballs and cook over high heat until browned on the bottom. Turn the meatballs, reduce the heat to moderate and cook until browned on the second side, about 3 minutes. Transfer the meatballs to a large plate.
In a medium saucepan, heat the oil. Add the garlic, onion, thyme and oregano and cook over moderate heat until softened, about 4 minutes. Add the tomatoes, cover and cook over moderate heat for 6 minutes, stirring occasionally. Using an immersion blender, puree the sauce until slightly chunky; alternatively, puree the sauce in a food processor and return the sauce to the saucepan.
In a small saucepan, cover the olives with water and bring to a boil over high heat; drain well. Add the olives to the tomato sauce, season with salt and pepper and bring to a simmer. Add the meatballs, simmer until heated through and serve.
Gnocchi Parisienne or plain pasta.