Combine wine, vinegar, Sugar, garlic, green onion, red pepper and red pepper flakes in an 8 cup microwaveable casserole. Cover; microwave at high for three to five minutes or until mixture is simmering. Add Mushrooms. Cover; microwave at high 6 to 8 minutes or until Mushrooms are tender but not mushy. Stir partway through cooking. Stir in salt, oregano, and pepper. Let stand, covered, for thirty minutes. Transfer to covered jar or container. Can be refrigerated up to one week. Actually, it's a good one, even if you can't stand microwave cooking. Just watch the Mushrooms carefully while they cook. They're also good when reheated.