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Grate the two lemons zest and squeeze the juice of one lemon (you will need about 50 g of juice), which you will keep separately.
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Melt the butter gently and heat the milk aside.
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Whisk the eggs together with the sugar and then mix the liquid butter.
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Incorporate the cornstarch and the flour, already mixed and sifted.
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Only at this point pour the hot milk, little by little. At the end, season with the grated zest and 4-5 tablespoons of the lemon juice kept aside.
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Pour the mixture into a round mold of 20-22 cm diameter (or oval or rectangular if you prefer) and bake at 150°C for 45-50 minutes. Let the flan cool in the mold and then serve it sliced.