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Heat the oven to 175 Celsius degrees and grease the pans well. Place baking paper at their bottom.
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In a food processor with a steel blade, put pistachios and flour and grind into a thin powder.
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Add in baking powder and salt and mix.
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Heat milk in the microwave or a small pot until it is warm.
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In a mixer bowl with a whipping attachment, put eggs and sugar and beat at medium to high speed until you get a light, airy foam.
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Add the oil and the lemon peel and mix slowly until they incorporate in the mixture.
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Add half of the pistachio-flour mixture and gently fold it with a whisk.
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Add the milk and mix well until incorporated, then add the remaining pistachio-flour mixture and fold with a whisk only until uniform.
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Pour the batter into both molds and divide evenly.
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Bake the cakes for 18-20 minutes or until a skewer inserted into the center comes out dry.
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Run with a knife through the sides of the pans, and allow the cakes to cool for about 10 minutes at room temperature, then remove from the pans. Cool completely.