Gordon Hamersley’s Beet, Goat Cheese and Walnut Tart

Name: Beet, Goat Cheese and Walnut Tart
Ingredients: 2 Beets, small; 1 Onion, medium; 2 tbsp Parsley, fresh; 3 Eggs, large; 1 1/2 cups All-purpose flour; 1/2 tsp Kosher salt; 1 Kosher salt and freshly ground black pepper; 1 Recipe tart dough; 1 tbsp Butter or olive oil, unsalted; 1 tbsp Walnut oil; 4 tbsp Ice water; 10 tbsp Butter, unsalted; 3/4 cup Heavy cream; 2 tbsp White wine, dry