Wasabi Salmon with Bok Choy, Green Cabbage, and Shiitakes

INGREDIENTS

• 1 teaspoon wasabi paste (Japanese horseradish paste)
• Kosher salt, freshly ground pepper
• 1/4 cup mayonnaise
• 1 pound baby bok choy, halved
• 2 large garlic cloves, finely grated
• 2 tablespoons olive oil
• 4 ounces shiitake mushrooms, stemmed, sliced if large
• 2 cups (packed) finely shredded green cabbage (about 5 ounces)
• 4 6-ounce skinless salmon fillets (preferably wild)
• 1 1" piece ginger, peeled, finely grated