Vegetarian Shepherd's Pie

Name: Vegetarian Shepherd's Pie
Prep time: 35 min
Cook time: 25 min
Total time: 1 h
Cuisine: American
Ingredients: 1 and ½ lbs. Yukon gold potatoes, peeled and cut into 1-inch chunks; 1 lb. cauliflower, cut into florets; 2 tsp. kosher salt; ¼ cup vegetable broth; salt and pepper, to taste; 16 oz. baby portobello mushrooms, washed and dried; 5 tsp. olive oil, divided; 1 medium onion, diced; 3 medium carrots, peeled and diced; 2 cloves garlic, minced; 2 and ½ cups vegetable broth; ¼ cup vegan red wine; 2 Tbsp. tomato paste; 2 tsp. vegan Worcestershire sauce; 2 tsp. fresh thyme (or substitute 1 teaspoon dried thyme); 1 tsp. finely chopped fresh rosemary (or substitute ½ teaspoon dried rosemary); 1 cup uncooked green lentils, rinsed and drained; 1 cup frozen peas; Salt, to taste