Ingredients

• 1/4 cup extra-virgin olive oil
• 2 tablespoons chopped green garlic or 1 regular garlic clove, blanched
• 1/4 teaspoon fleur de sel or coarse kosher salt
• 3/4 cup mayonnaise, divided
• 2 teaspoons fresh lemon juice
• 2 (3-ounce) packages thinly sliced pancetta (Italian bacon; about 30 slices)
• 12 (1/2-inch-thick) slices brioche or egg bread, lightly toasted
• 1 large bunch mizuna or arugula, torn into 2-inch pieces
• 3 beefsteak tomatoes, cut into 1/4-inch-thick rounds

Instructions

1. **For aioli:**Blend olive oil, garlic, and 1/4 teaspoon fleur de sel in processor until garlic is minced. Add 2 tablespoons mayonnaise and blend well. Transfer to small bowl; whisk in remaining mayonnaise and lemon juice.
2. Do ahead: Can be made 1 day ahead. Cover; chill.
3. **For sandwiches:**Preheat oven to 450°F. Arrange pancetta slices in single layer on 2 large rimmed baking sheets. Bake until crisp, about 10 minutes. Transfer to paper towels to drain. Place toast on work surface. Spread with aioli. Divide mizuna among 6 toast slices; top with tomatoes, then pancetta, dividing equally. Top with remaining 6 toast slices, aioli side down. Cut each sandwich in half and serve.
4. **For sandwiches:**Preheat oven to 450°F. Arrange pancetta slices in single layer on 2 large rimmed baking sheets. Bake until crisp, about 10 minutes. Transfer to paper towels to drain.
5. Place toast on work surface. Spread with aioli. Divide mizuna among 6 toast slices; top with tomatoes, then pancetta, dividing equally. Top with remaining 6 toast slices, aioli side down. Cut each sandwich in half and serve.