We made a cheesecake using blood oranges for flavoring. It didn't turn it red but there is a slight pink tint to it. The flavor really is the best part anyhow.
If you have never had a blood orange, they're very sweet and juicy. Unfortunately the ones we had had been sitting for a while and had lost some of their juice but we still got enough for the recipe.
This should work with most cheesecake recipes but if it turns out horribly wrong when you try it then I'm glad I said "should".
In a small sauce pan comgine 1 cup orange juice, 1/4 cup sugar and 2 tablespoons orange zest.
Boil until sugar dissolves then lower heat to medium and simmer for 20 minutes.
Chill in the fridge to at least room temperature.
Pretty simple and tasty.
Nom nom nom nom nom...
