Active Time

　　20 min

　　Total Time

　　20 min

Ingredients

　　1 1/2 tablespoons fresh lemon juice

　　1/4 teaspoon Dijon mustard

　　3/8 teaspoon salt (preferably fine sea salt)

　　1/8 teaspoon black pepper

　　1/3 cup extra-virgin olive oil

　　2 hearts of romaine, trimmed, quartered lengthwise, then sliced crosswise into 1/4-inch strips (8 cups)

　　3/4 lb Bibb lettuce (3 medium heads), trimmed, quartered lengthwise, then sliced crosswise into 1/4-inch strips

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