Vegan Wellington

Name: Vegan Wellington
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: European, British
Ingredients: 1 frozen puff pastry sheet; 1 large carrot (peeled and chopped); 1 large celery stalk (chopped); 1 tablespoon vegan butter (or oil); ⅔ cup dry lentils (green or brown); 2 cups water; 2 teaspoons vegan Worcestershire sauce (see notes); 1½ teaspoon vegetable or "no beef" bouillon (see notes); 1½ teaspoon garlic powder; 1 teaspoon onion powder; ½ teaspoon paprika; ½ teaspoon sage; ½ teaspoon thyme; ¼ teaspoon black pepper; soy sauce or salt to taste; 2 cups chopped kale (loosely packed); ½ cup roasted unsalted sunflower seeds (coarsely chopped); ¼ cup panko breadcrumbs; 2 tablespoons non-dairy milk