If you’re planning to make your Wellington for Thanksgiving or Christmas and want to prep in advance, you have two options. First, you can prep the Wellington filling 1-2 days in advance and store it in an airtight container in the refrigerator. Or, make and freeze the vegan Wellington before baking. Follow the recipe instructions right through baking and tightly wrap the wellington in plastic wrap, then foil and freeze for up to 3 months. Then bake the vegetable Wellington directly from frozen until warmed through and browned. This will likely take 10-20 minutes longer since Wellington is frozen.