1. Heat your oven to 180°C.
2. Clean the Chinese yams well, removing tough, woody strings without peeling.
3. Cut into 15 cm pieces, then cut lengthwise into chip-like shapes.
4. Mix together all other ingredients, then brush or rub over the yam using a pastry brush or your hands. If coconut oil is set, heat it before using.
5. Place the yam on a well-oiled baking tray and roast for 15 minutes, or until golden around the edges but still plump.