Preheat oven to 350F. Grease, flour, and line the base of a 9” springform pan with parchment paper.
Beat eggs with sugars until ribbons drip from the whisk. Blend in oil, yogurt, juice, and zest.
Gently blend in remaining dry ingredients. Pour into prepared spring form.
Bake for 35-40 minutes until a skewer inserted comes out with just a few crumbs. Allow to cool in pan for 15 minutes before removing ring. Allow to cool completely.
Whip cream to soft peaks. Add corn starch, sugar, and lemon zest. Whip to stiff peaks.
Fold in crème fraiche. Cover and return to fridge until ready to assemble.
Once cake is cool, cut in half with a serrated blade.
Place bottom half of cake on a plate or cardboard cake round. Spread cream on cake and cover with other half.
Heat glaze ingredients in a sauce pan, swirling gently, until sugar is dissolved. Bring to boil for 30 seconds.
Pour over top of cake in a circular motion. Garnish with candied citrus zest if desired.