3 tablespoons white balsamic vinegar
2 tablespoons grapeseed oil
1-1/2 tablespoons finely chopped shallot
8 cups lightly packed baby frisée or mixed salad greens, separated into leaves
2 cups mixed grapes, halved, and seeded if necessary
1/2 cup crumbled blue cheese, such as Point Reyes or Maytag (about 2 oz.)
Kosher salt and freshly ground black pepper

In a salad bowl, whisk the white balsamic vinegar and the oil. Add the shallot and let sit for 5 minutes. Add the frisée, grapes, and cheese and toss to combine. Season to taste with salt and pepper.