BBQ Chicken Kebabs

Name: BBQ Chicken Kebabs
Ingredients: 500 gm Chicken breast fillets ((or thighs also work)); 40 ml Soy (light or Japanese soy) ((2 Tablespoons)); 1 teaspoon cumin, ground; 2 tablespoons smoked paprika; 50 ml Tomato Sauce or ketchup ((4 tablespoons)); 10 gm sugar, caster ((2 teaspoons)); 40 ml olive oil ((2 tablespoons)); 4 tablespoons tomato sauce; 1/2 teaspoon cumin, ground; 2 tablespoons olive oil; a pinch sea salt flakes; 500 gm potatoes (sliced); 60 ml cream ((1/4 cup)); 60 ml water ((1/4 cup)); 50 gm cheese (grated ( cheddar )); 5 gm salt and pepper