For the breakfast cake, mix flour with baking powder and salt. Add condensed milk, eggs, lemon juice and oil and mix with a mixer until fluffy. Spray a cake pan with shortening.
Pour the batter into the pan and bake in a preheated oven at 180 °C for about 35 minutes until golden brown. Allow the cake to cool and remove from the pan. Coarsely chop the nuts.
Melt the couverture in a water bath and coat the cake with it. Spread the nuts on top.