Lentil Shepherd’s Pie

Name: Lentil Shepherd’s Pie
Cuisine: European, British
Ingredients: 1 cup dried green or brown lentils; 2 1/2 cups vegetable broth; 1 tablespoon olive oil; 1 large onion, diced; 2 carrots, diced; 2 celery stalks, diced; 1/2 cup frozen peas; 2 cloves garlic, minced; 1 tablespoon tomato paste; 1 tablespoon coconut aminos; 1 teaspoon dried thyme; 1 teaspoon dried rosemary; 1 teaspoon dried oregano; Salt and pepper to taste; Sprig of parsley for garnish (optional); 4 large potatoes, peeled and cubed; 2 tablespoons vegan butter or olive oil; 1/4 cup unsweetened non-dairy milk (such as almond or coconut milk)