Mushroom Wellington with Roasted Asparagus and Garlic Mashed Potatoes

Ingredients

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