Peel and grate the pumpkin in a large mixing bowl. Stir in semolina flour, brown sugar, baking soda, cinnamon powder, vanilla extract, and Greek yogurt. Mix to combine all ingredients together.
Line a 9×13 inch baking pan with parchment paper and grease it with some butter.
Spread the batter into the prepared baking dish. Bake at 350˚F for 40-45 minutes, my oven took 40 minutes.
Meanwhile, make the sugar syrup. Combine water, sugar, and lemon juice in a saucepan. Bring to a boil and let it simmer for 3-5 minutes until it thickens a little.
Pour the syrup over the cake and let it cool completely.
Serve next to a cup of hot chocolate or a combo with a scoop of vanilla ice cream!