Cabbage and Radish Slaw with Peanut Dressing

finely chopped peeled fresh ginger

coarsely chopped shallot

plus 1 tablespoon creamy peanut butter

rice-wine vinegar (not seasoned)

soy sauce

packed dark-brown sugar

canola oil

small green cabbage, (about 1 3/4 pounds), finely shredded

medium daikon radish, cut into 1/8-inch-thick matchsticks

red radishes, halved lengthwise and cut into thin half-moons

scallions, cut on the diagonal into long, thin slices

dry-roasted peanuts