Adapted from Cake Central
1 c light corn syrup
1 c shortening
1/2 t salt
1 t clear vanilla (you can also add any other flavoring to taste)
2 lbs (approx. 8 c) powdered sugar
In a large bowl, stir together shortening and corn syrup. Mix in salt and vanilla, then gradually mix in the sugar until it is a stiff dough. If you are using a stand mixer, use the dough hook attachment. If dough is sticky, knead more powdered sugar until it is smooth. Store in airtight container in fridge or at room temp.