Clean part of a raw pumpkin. Grate it. Shell the walnuts. Grind them in a walnut grinder. In a deep bowl, using a mixer, beat the eggs until they increase in volume and the mixture becomes fluffy.
Then add the sugar and beat again continuously. Add the oil and continue beating with the mixer. Sift the flour into another bowl, add the baking powder and stir to mix them well. Gradually add the flour to the bowl with the egg mixture and stir gradually, without the mixer this time.
Finally add in the grated pumpkin and ground walnuts. Add 2-3 tsp cinnamon. The cinnamon provides a nice aroma to the cake.
Oil a round cake form with removable sides and flour it. Pour the mixture into the form and smooth it out well with a spoon so that the cake remains smooth during baking.
Bake in a preheated 356°F (180 °C) oven. Check with a toothpick to see if it's ready. Once it's baked, take it out, leave to cool a bit and cut into rhombuses. Sprinkle with powdered sugar through a sieve. Serve with coffee.
Enjoy! Once finished it's really soft, tasty and aromatic.