You can replace 1 cup of light corn syrup with 1 1/4 cups granulated sugar dissolved in 1/4 cup hot water or other liquid used in the recipe.
For 1 cup of dark corn syrup, you can use the following substitutions:
- 3/4 cup light corn syrup plus 1/4 molasses
- 1 cup honey
- 1 1/4 cups packed brown sugar dissolved in 1/4 cup hot water or other liquid used in the recipe
One of the common uses of corn syrup is in pecan pie. In the recipe for Mom's Pecan Pie (photo) you can use either light or dark corn syrup, or any of the substitutions I've listed above and it should turn out just fine.