Keep the screen awake with cook mode on the Good Food app.
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Method
step 1
Preheat oven to 160 degrees Celsius (fan assisted) / Gas Mark 3; and grease an 9 inch (23 cm) spring form cake tin.
step 2
Put pistachios into a food processor and blend to a fine powder.
step 3
Melt butter gently in a pan and add to olive oil.
step 4
Whisk eggs and sugar until light and fluffy.
step 5
Slowly add the butter and oil mixture into the whisked egg mixture a little at a time with the whisk on a low speed until you have a thick emulsion.
step 6
Sift the flour, then whisk the dry ingredients (polenta, plain flour, baking powder and pistachios) into the egg mixture.
step 7
Add the juice and zest and fold into the mixture.
step 8
Add the mixture into the prepared tin and bake in the middle of the oven for 50 minutes. Don't worry if the cake is slightly underdone in the middle - the cooling process will finish it off.
step 9
Rest in tin for 10 minutes then turn out and cool on a cake rack.