Ingredients

  • 3/4 cup pure olive oil
  • 3/4 cup canola oil
  • 1/2 ounce dried porcini mushrooms
  • 1 large egg (see Note)
  • 1 large egg yolk
  • 1 tablespoon Dijon mustard
  • 1 tablespoon fresh lemon juice
  • 3/4 teaspoon fine sea salt
  • 1/4 teaspoon freshly ground black pepper

Method

  • Blend the oils and set aside.
  • Bring 1/2 cup water to a boil in a small saucepan and add the mushrooms.
  • Remove from the heat and set aside to steep for 10 minutes to reconstitute.
  • Place the egg, yolk, mustard, lemon juice, salt, and pepper in a food processor.
  • Lift the mushrooms out of the water and gently squeeze out as much water as possible over the sink.
  • Set aside the mushroom water left in the pan.
  • Roughly chop the mushrooms and add to the food processor.
  • Puree the mixture and, with the machine running, slowly add the blended oils in a thin, steady stream to make an emulsion.
  • Spoon 2 tablespoons of the lukewarm mushroom water off the top and add in a steady stream while the machine is running.
  • The mayonnaise can be used immediately or covered with plastic wrap and refrigerated for up to a week.