In a small bowl, stir together butter, parsley, lemon zest and juice, horseradish, and mustard.
Season both sides of fillets with salt; lay, flat side up, on a clean work surface. Reserve 2 teaspoons butter mixture; dividing evenly, spread remaining butter mixture on top of fillets. Fold fillets in half crosswise, enclosing butter mixture.
Place folded fillets in a 9-inch microwave-safe dish with a tight-fitting lid. Top with reserved butter mixture, dividing evenly. Cover; microwave on high until fish is just cooked through, about 5 minutes.
To serve, place fillets on plates, and spoon juices from dish over fillets; garnish with lemon wedges, if desired.
The butter mixture gives the mild-tasting sole added flavor. Spread it down the center of each fillet, then put another spoonful on top of the folded fish.
This is awesome. It is so easy and so delicious. I never cooked fish in the microwave before--fortunately our store had some fresh sole--I tried it one night, liked it so much, went back for more sole and had it again the next night. A real keeper.
Cut me off. NO ONE will believe this came out of the microwave!
Wow! This was so easy