Step 1
In a small bowl, combine the pistachios, parsley, capers, rice vinegar, honey and 1/4 cup olive oil. Season with salt and pepper and set aside.
Step 2
Combine flour with 3/4 teaspoon salt and 1/2 teaspoon pepper on a large, flat plate.
Step 3
Heat 2 tablespoons olive oil in a large non-stick skillet or well-seasoned cast iron pan over high heat. Dredge half the sole in the flour and cook until lightly browned on the bottom, about 2-3 minutes. Turn and brown the other side, another 2-3 minutes. Transfer to a plate and cover to keep warm. Add the remaining olive oil and repeat with the remaining fish.
Step 4
To serve, divide fish between serving plates and top with the pistachio salsa.