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Mix the oils and keep aside.
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Put the egg yolks, salt, and 2 tablespoons of oil in a bowl or in the container of a handstick mixer, and start blending everything together.
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Add the egg whites and keep blending.
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Now start adding the remaining oil slowly, in a thin, slow and steady stream. Keep blending while adding the oil.
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When you have incorporated all the oil and the mayo has thickened, you can slowly add the lemon juice and mustard while still blending.
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When all the lemon juice has been incorporated your mayo is ready.
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