Tart Orange Panna Cotta
From The Splendid Table
10 minutes prep time; 4 to 24 hours refrigerator time.
Serves 8 to 10
1/4 cup cold water
4-1/2 teaspoons unflavored gelatin
4 1/2 cups heavy whipping cream
3/4 cup sugar, or more to taste
Pinch of salt
2 -1/2 teaspoons vanilla extract
1 tablespoon of fine-grated orange zest
1 -1/2 cups sour cream
1. Make the panna cotta in two equal batches. For each one have the cold water in a small cup, and sprinkle the gelatin over it. Let it stand 5 minutes. Meanwhile, in a 3-quart saucepan over medium-high heat, stir together half the cream with half the sugar, salt, vanilla, and orange zest. Do not let it boil. Stir in the gelatin until thoroughly dissolved. Take the cream off the heat and cool about 5 minutes.
2. Put half the sour cream in a medium bowl. Gently whisk in the warm cream a little at a time until it is smooth. Taste the mixture for sweetness, it may need another teaspoon of sugar. Turn the panna cotta into a deep glass serving bowl. Cover, and chill 3 hours.
3. Cut the sponge cake into 1/2-inch thick pieces that are about 3 by 3-inches. Blend the marmalade with the lemon juice and taste for tartness. Spoon it over the cake slices.
4. Once the panna cotta is firmed up in the refrigerator, top it with half the sponge slices. Make the second batch of panna cotta with the remaining ingredients, pour it over the first and top it with the remaining sponge slices. Don't worry if they sink down a bit. Chill overnight. Serve cool spooned into small bowls.