Blood Orange and Campari Jellies with Sliced Oranges

I've made this dessert many times, and it is great if you are looking to avoid dairy or carbs but still want a delicious, refreshing end to a meal.  Of course, fresh orange juice and Campari make a sublime drink over ice, and go perfectly together in a dessert too.  I use this recipe from the brilliant 'Taste' site in Australia - the only difference being that I substitute leaf gelatine - about 3 leaves - for the powdered, as I find it dissolves much better.  I also leave the pink grapefruit out, as I like the purity of the oranges.  But I have made it with just pink grapefruit juice instead of the orange, and in that case I would use slices or 'fillets' of the fresh fruit to accompany it.  They are setting in the fridge right now, and I am trying to resist just chugging them down!  picture courtesy of www.taste.com.au