Slice the leek into rings. Meat - cubes. In a saucepan, heat the oil, put sugar and stir 2 minutes, then add the leek, ginger, salt and cinnamon, stir and add meat. Fry on high heat, stirring constantly. Add the soy sauce and add enough water that the meat was covered. Bring to boil and diminished the fire, simmer about 30 minutes. Starch diluted with 2 tbsp water and pour into the pan, slightly warm so that the sauce thickens. Served with rice and grilled sesame zucchini.