2 tablespoons dried currants
7 tablespoons white balsamic vinegar, divided
1 tablespoon unseasoned rice vinegar
1 tablespoon honey
1 tablespoon extra-virgin olive oil
1 teaspoon salt
2 bunches Tuscan kale (about 1 pound), center ribs and stems removed, leaves thinly sliced crosswise
2 tablespoons pine nuts, lightly toasted
Parmesan cheese shavings
Place currants in small bowl; add 5 tablespoons white balsamic vinegar. Let soak overnight. Drain currants.
Whisk remaining 2 tablespoons white balsamic vinegar, rice vinegar, honey, oil, and salt in large bowl. Add kale, currants, and pine nuts; toss to coat. Let marinate 20 minutes at room temperature, tossing occasionally. Season to taste with salt and pepper. Sprinkle cheese shavings over salad and serve.