Take a mixing bowl, add melted butter, powdered sugar and mix well.
Add baking powder, cardamom powder, food color and mix well.
Add semolina/Rava and mix again.
Pour milk little by little and mix until the batter turns into pouring consistency.
Leave the batter for 10 to 15 minutes.
Semolina absorbs the moisture and becomes hard.
Pour milk and mix the batter again until it turns into semi pouring consistency.
Grease the cake pan with butter and dust it with the flour.
Pour the batter into the tin and add chopped nuts.
Put a sand or salt layer in a pressure cooker and pre-heat for 5 minutes.
Place the cake pan on the sand and cover it with the lid (remove the gasket).
Bake for 35 to 40 minutes or until a toothpick inserted comes out clean.
Let it cool down. turn the cake upside down on a plate.