Dates are cleaned from the stones and scalded with hot water. Leave to soak for 10 minutes, then drained and chopped or ground in a blender. Kernels are ground in a blender with 2-3 tsp sugar. Mix in the sifted flour and dates. Sprinkle with a little salt. Egg whites are separated from the yolks and broken snow by adding sugar. The yolks were broken using a blender and mixed with the egg white. Gradually add the walnut mixture. Taste with crushed cardamom, orange zest and olive oil and mix. Transfer to a greased and floured cake pan. Bake for about 45 minutes in a preheated 160 C oven. Cake is served cold and sprinkled with powdered sugar.