Ginger-Spiced Cucumbers

1/4 cup seasoned rice vinegar
1/4 cup mirin (sweet cooking rice wine)
1/4 cup packed brown sugar
2 teaspoons grated fresh ginger
1 large cucumber, peeled and thinly sliced
1/4 cup thinly sliced red onion or scallions
 
     In a medium bowl combine rice vinegar, mirin, brown sugar, and ginger. Stir in cucumber and onion slices. Cover and chill for 30 minutes. Serve with a slotted spoon. Makes 4 to 6 side-dish servings.