1. Heat 3 tablespoons oil in a medium skillet over medium heat until hot but not smoking. Add shallots and garlic; cook, stirring, until softened, about 2 minutes. Transfer to a medium bowl; let cool. Stir in capers, zest, parsley, basil, and mint. Season with salt and pepper. Cover with plastic wrap; set aside.

2. Blend vinegar, mustard and lemon juice, plus salt and pepper to taste, in a blender until combined. With blender running, pour in remaining 1 cup plus 2 tablespoons oil in a slow, steady stream; blend until emulsified. Just before serving, stir vinaigrette into shallot mixture.