Place the beef, onion, garlic, paprika, coriander, cumin, and 1 teaspoon of the salt in a bowl and mix to combine well.
Form the meat into 8 equal sausages.
Heat 1 tablespoon of the oil in a large saucepan over medium-high heat and saute the kofta sausages for 6 minutes, turning every 2 minutes to brown evenly.
While the kofta are cooking, in a small bowl, mix together the yogurt, mint, lemon juice, and remaining salt.
Serve the kofta in a flatbread with the lemon yogurt sauce, cucumber and tomato slices.