Cottage Pie with Sweet Potato Mash

sweet potato 21.0% , potato 19.0% , beef 15.0% , water 8.5% , onion 8.2% , carrot 7.4% , celery 5.6% , milk 4.6% , Thickener 4.0% , butter 3.3% , tomato concentrate 1.7% , potato 0.8% , worcestershire sauce 0.4% , garlic 0.2% , beef gelatin 0.1% , soy sauce 0.1% , salt 0.0% , coating 0.0% , red wine vinegar 0.0% , yeast extract 0.0% , Stabiliser 0.0% , canola oil 0.0% , thyme 0.0% , pepper 0.0% , natural preservative 0.0%