To make the kofta, put the lamb in a large bowl and break it up with a wooden spoon. Add the egg, garlic, oregano, thyme and onion and mix well. Add the breadcrumbs and use your hands to mix well.
Have a large board or plate ready, then roll the lamb mixture into 24 even walnut-sized balls. Flatten the balls slightly on the palm of your hand to make small patties, about 5 cm across and about 1 cm thick.
Heat the oil in a large frying pan. Add the koftas, nudging them up to each other—they should just about fit, as they shrink as they begin to cook. Cook over a high heat for 2 minutes until browned underneath, then turn them over and cook for a further 2 minutes.
Reduce the heat to medium, turn the patties again and cook for about 8 minutes, shaking the pan occasionally, and turning the patties once more, until cooked through.
Meanwhile, mix the chopped fresh herbs with the spring onions and rocket. Warm the pita breads in a toaster or under the grill, turning them once.
Slit the pita breads open and place four koftas in each. Add some cucumber slices and herb salad and squeeze over a little lemon juice. Drizzle with yogurt and eat at once.