INGREDIENTS
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1 large egg yolk, room temperature
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1-2 tablespoons fresh lemon juice
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1/4 freshly grated Parmesan cheese
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2 teaspoons Dijon mustard
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1 handful (about 1/4 cup) basil leaves
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1 clove garlic, peeled
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1/4 - 1/2 cup vegetable oil
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1/4 cup olive oil