PreparationMake lemon oil In medium heavy saucepan over very low heat, combine oil, lemon peel, lemon thyme, and lemongrass. Cook, uncovered, until aromatic, about 1 hour. Do not let oil boil. Remove from heat and cool to room temperature. Strain through fine-mesh sieve into medium heatproof container and refrigerate until cool, about 1 hour. (Oil can be refrigerated, in airtight container, up to 5 days). Make vinaigrette In medium bowl, whisk together lemon juice, mustard, salt, and pepper. Slowly whisk in 1/4 cup lemon oil, then olive oil. (Vinaigrette can be made up to 3 hours ahead and chilled, covered. Bring to room temperature and stir before serving.)
PreparationMake lemon oil In medium heavy saucepan over very low heat, combine oil, lemon peel, lemon thyme, and lemongrass. Cook, uncovered, until aromatic, about 1 hour. Do not let oil boil. Remove from heat and cool to room temperature. Strain through fine-mesh sieve into medium heatproof container and refrigerate until cool, about 1 hour. (Oil can be refrigerated, in airtight container, up to 5 days). Make vinaigrette In medium bowl, whisk together lemon juice, mustard, salt, and pepper. Slowly whisk in 1/4 cup lemon oil, then olive oil. (Vinaigrette can be made up to 3 hours ahead and chilled, covered. Bring to room temperature and stir before serving.)