This pineapple cake filling is creamy, thick, and packed full of pineapple flavor. It's the perfect filling for a cake that needs a tropical twist and a bit of moisture. The consistency is not too thin that it oozes out, and not too thick that it solidifies inside the middle. Lemon juice adds some brightness and helps bring out the pineapple flavor. I also added in a bit of butter to help thicken and keep the filling extra creamy. Use this filling in my carrot cake with pineapple recipe.