Prep time 30 minutes
Cook time 45 minutes
Yield: Serves or Makes 8-10
Preheat oven to 350°. Line a 9-inch cake pan with parchment paper and brush all sides and bottom well with oil. Brush the paper too.
Place ¼ c sugar and water in a small saucepan. Bring to a simmer, and cook, swirling occasionally, until thickened, about 6-8 minutes. Pour syrup over bottom of pan.
Arrange orange slices over syrup in pan. Cut into segments to fill in any gaps.
Add dry ingredients (including remaining 1 c sugar) to a large bowl and whisk to combine.
Make a well in the center of dry ingredients, then add eggs and whisk to combine. Whisk in yogurt, citrus zest and oil until batter is smooth.
Pour batter over citrus slices and spread to evenly coat.
Bake cake until golden brown and a tester comes out clean when inserted in the center, about 40-50 minutes.
Let cool completely in pan, then invert onto a serving plate.