Lemon pie filling is a commercially prepared pie filling made with eggs, cornstarch and flavoring. This is a shelf-stable pantry item and can be found in most grocery stores. Use pre-made pie fillings for making quick pies and desserts. You can use it many recipes that call for lemon curd.
You can purchase this pie filling in cans and jars. It can also be found "boxed" in the pudding and pie filling section of your grocer. If you can't find it at your local grocery store such as Walmart or specialty shop (like Williams Sonoma) you can purchase it online at Amazon.com: Comstock Pie Filling & Topping
If you don't have lemon pie filling you can substitute: