Ingredients:

• 1 large head butter lettuce (about 9 inches wide at crown)
• 1/2 cup lightly packed flat-leaf parsley leaves, roughly chopped
• 1/4 bunch chives (about 35 thin chives), cut crosswise into 1/2-inch pieces
• 8 large mint leaves, very thinly sliced
• 1 1/2 tablespoons olive oil
• 2 teaspoons red wine vinegar
• 1 teaspoon Dijon mustard
• 1 teaspoon water
• 1/4 teaspoon kosher salt
• 1/8 teaspoon freshly ground black pepper