This cake gets its moistness from a generous dose of orange-scented simply syrup, which is poured over the cake while its hot from the oven, and gets absorbed into all the crumbs. Your kitchen will smell like heaven 🙏.
First make the simple syrup. In a small pot over medium-high heat, combine the water, orange juice, and sugar. Bring to a boil then reduce the heat and let simmer for about 5 minutes until it is the consistency of maple syrup. Remove from the heat and let cool while you work on the cake.
In a large bowl, combine the eggs and sugar, and using an electric hand mixer, mix until light and fluffy, 3 to 5 minutes. Then add the oil, yogurt, semolina, flour, vanilla, baking powder, and orange zest. Using a wooden spoon or silicone spatula, gently combine all the ingredients just until there are no more streaks of flour.
Lightly grease a 9 x 13 baking pan and pour in the batter. Top with thin slices of oranges, if using. Bake for 30 minutes or until a toothpick comes out clean.
Remove the cake from the oven and, while it is still hot, pour the cooled syrup all over. Let the cake rest and absorb all the syrup for at least 1 hour before serving. Enjoy!