Lemon and Lime Angel Food Cake with Orange Yogurt Sauce

Light and fluffy and topped with an Orange Yogurt Sauce, this Angel Food cake is perfect for summer entertaining.

1 cup cake and pastry flour, sifted (250 mL)
1½ cups sugar (375 mL)
1½ cups egg whites (about 11 eggs) at room temperature (375 mL)
1 Tbsp. lemon juice, freshly squeezed (15 mL)
1 tsp. cream of tartar (5 mL)
½ tsp. sea salt (2 mL)
1 tsp. pure vanilla extract (5 mL)
1 Tbsp. lemon rind, freshly grated (15 mL)
1 Tbsp. lime rind, freshly grated (15 mL)

Orange Yogurt Sauce:
4 cups plain yogurt (1 L)
1 cup orange juice, freshly squeezed (250 mL)
2 Tbsp. sugar (25 mL)
4 Tbsp. orange rind, freshly grated (25 mL)

Garnish:
orange segments

Preheat an oven to 350°F (180°C/160°C fan, Gas Mark 4).

Into bowl, sift together ¼ cup (50 mL) of the flour and ¾ cup (175 mL) of the sugar, sift again. Set aside. In large mixing bowl (not plastic), beat egg whites until foamy. Add lemon juice, freshly squeezed, cream of tartar and sea salt, beat until soft peaks form.

Gradually add remaining sugar, 2 Tbsp. (25 mL) at a time, beating until mixture is glossy and stiff peaks form.

A-quarter at a time, sift flour mixture over egg whites, gently folding in each addition until well blended. Gently fold in vanilla and lemon and lime rinds. Pour into ungreased 10” (4 L) tube pan.

Run spatula through batter-eliminate any large air pockets. Smooth top with spatula.

Bake in a preheated oven for 40-45 minutes or until cake springs back when lightly touched.

Turn pan upside down and let hang on legs attached-pan or on inverted funnel, or bottle, until completely cool. Remove from pan. (Cake can be stored in airtight container for up-2 days or frozen for up-1 month.)

Orange Yogurt Sauce: 
Line plastic sieve with cheesecloth, set over bowl. Spoon in yogurt, cover and let drain in refrigerator for at least 12 hours or until thick. Discard liquid.

Whisk together drained yogurt, orange juice, sugar, orange rind and juice concentrate. Pour sauce over each serving.

Garnish with orange segments.