1. I used Predilecta Guava paste which I picked up at a little South American restaurant/shop near my house. There are many different brands out there, but I think they are mostly the same. I’m linking to the exact brand I used below.
2. These mini pies are best they day they are made, when slightly warm. But they will keep in the fridge in an airtight container for up to 5 days. You can warm them in the oven or toaster oven for a few minutes at 350°F.