Triple-A Veggie Sandwich

Ingredient:

• 1/2 cup extra-virgin olive oil
• 1 tablespoon grated orange zest plus 1/4 cup fresh orange juice (about 2 oranges)
• 1 tablespoon grated lemon zest plus 2 tablespoons fresh lemon juice
• 1 tablespoon minced garlic (about 3 garlic cloves)
• 1 tablespoon minced fresh ginger
• 1 tablespoon red wine vinegar
• 1 heaping teaspoon honey
• 1 teaspoon Dijon mustard
• 3/4 teaspoon black pepper
• 1/4 cup chopped fresh herbs (such as thyme, basil, and mint)
• 1/4 cup unsalted butter, softened
• 8 whole-wheat bread slices
• 1/2 cup mayonnaise
• 2 cups alfalfa sprouts
• 1/4 teaspoon kosher salt, plus more to taste
• 1/4 teaspoon black pepper, plus more to taste
• 1 medium avocado, cut into 16 slices
• 2 cups loosely packed arugula
• 3 large tomatoes, cut into 24 slices
• 1 medium cucumber, thinly sliced (about 1 1/3 cups)
• 1 medium red onion, thinly sliced (about 1 cup)
• 4 to 8 (1-ounce) cheddar cheese slices
• 1 cup loosely packed fresh cilantro leaves
• 1/2 cup loosely packed fresh basil leaves
• 4 romaine lettuce leaves, halved crosswise
• 1/2 cup Broken Orange Vinaigrette