Cut one lemon into thin round slices and set them aside.
In a large bowl, add the chicken cubes, 4 tablespoons of oil, the juice of one lemon, and a generous pinch of salt, and mix all the ingredients.
Thread the chicken cubes onto metal skewers alternating with folded slices of lemon.
Cook the chicken lemon skewers on a hot grill or cast iron skillet, turning them often for 5-10 minutes, or until the chicken is cooked through and golden brown.
Meanwhile, in a small bowl, mix the yogurt with the grated garlic, the lemon zest and 1 tablespoon of oil, and season with salt and pepper to taste.
When ready, transfer the lemon chicken skewers onto a serving dish and serve them with the yogurt sauce.
Notes
Alternatively, if you prefer, these lemon chicken skewers can also be baked in a preheated oven at 180C/360F for 20-30 minutes.