For the meatballs: in a large bowl, use your hands to mix together the meat, onions, parsley, spices, and salt. Shape the meat with your hands into 1-inch meatballs then set them aside.
For the tahini sauce: in a small bowl, mix the tahini and water until they are well combined, and then set aside the sauce.
For the kafta: in a cooking pot, heat 2 tablespoons of the olive oil over medium heat, then stir in the onion strips and salt. Cook the onions for 3 to 4 minutes, until the onions become tender. Add the remaining 1 tablespoon of olive oil to the pan, then stir the meatballs and onions together. Cook, stirring occasionally, for 12 to 15 minutes, until the meatballs reach a temperature of 165 degrees F on an instant-read thermometer inserted into the center of a meatball.
Stir the tahini into the mixture to coat the meatballs and onions. When the sauce comes to a boil, remove the pan from the heat and serve the kafta.