Shepherds Pie

potato 53.0% , lamb 16.3% , water 8.2% , onion 5.0% , celery 3.4% , butter 2.5% , corn flour 1.9% , tomato purée 1.5% , roast lamb stock 1.3% , rapeseed oil 1.1% , salt 0.9% , tomato 0.8% , E150a 0.7% , vinegar 0.6% , sugar 0.5% , dehydrated onion 0.5% , cracked black pepper 0.4% , spice 0.4% , tamarind 0.4% , garlic puree 0.3% , lemon oil 0.3%