Place the ground beef and ginger in a mixing bowl
Crush the fennel seeds in a mortar and pestle (if you don't have one, the flat of a knife on a cutting board works fine), mix with cinnamon, and add to the beef.
Mix thoroughly with your hands and form into small (walnut-sized) balls.
Place the tomatoes, curry powder, and turmeric into a saucepan, add salt & pepper, and bring to a boil. Reduce the heat and gently place the meatballs into the sauce.
Cover and cook gently for 15-20 minutes, stirring and turning the meatballs occasionally so that they are thoroughly cooked.
Remove from heat and serve.