Ingredient:

• Two large or 4 smaller sandwiches
• 1 baguette (16 ounces)
• 1 tablespoon thick balsamic vinegar or balsamic glaze*
• 1 tablespoon extra-virgin olive oil
• 1 ½ cups baby arugula
• 1 mozzarella ball (8 ounces)
• 2 medium ripe tomatoes, sliced into ¼-inch thick rounds
• Flaky sea salt or kosher salt
• Creamy basil sauce (this makes extra**)
• 1 small or ½ medium clove garlic, roughly chopped
• ½ cup mayonnaise
• ½ cup (1 ounce) lightly packed fresh basil
• ¼ teaspoon fine sea salt
• Lots of freshly ground black pepper, to taste