Pre-heat the oven to 170 degrees C.Mix the semolina with sugar, cardamom and baking powder.Next, add oil and mix well. Finally add the mango pulp and mix again. Let it sit for 15 minutes.Pour the batter in a greased loaf/ 6 inch round pan and garnish with nuts of your choice.Place in the oven and bake for 30-35 minutes. Keep a close watch after 25 minutes, if it starts browning too quickly, lower the temperature a bit.Check with a toothpick in the center of the cake to see if properly baked. If it comes out clean then remove immediately. If it is kept for a longer time, the cake will develop a crust on the top.Allow to cool completely and then cut and serve.