Mushroom Wellington with Roasted Asparagus and Garlic Mashed Potatoes

Ingredients

• 4 tablespoons butter
• 1/2 cup heavy cream
• 1/4 cup grated Parmesan cheese
• 1 1/2 pounds asparagus
• 2 pounds Yukon gold potato
• 1 large yellow onion
• 2 cloves garlic
• 1 1/2 pounds mixed mushrooms
• 1/4 cup fresh parsley
• 1 whole lemon
• 1 package puff pastry
• 2 tablespoons olive oil
• 2 tablespoons balsamic vinegar
• 2 tablespoons all-purpose flour
• 1 cup vegetable broth
• 1 tablespoon Dijon mustard
• 1 tablespoon soy sauce
• 1 teaspoon sugar
• 1 teaspoon dried thyme
• 1/2 teaspoon salt
• 1/4 teaspoon black pepper