Ingredients

• 1.5 cups yellow onion, roughly chopped
  
• 1 pint button mushrooms, halved and thinly sliced
  
• 1.5 cups dry lentils
  
• 4 cups water
  
• 3 garlic cloves, minced
  
• 1 cup tomatoes, diced
  
• 3 tablespoons tomato paste
  
• 2 tablespoons italian seasoning
  
• 4 classic gourmet burger buns
  
• 6 kale leaves, rinsed
  
• 2 tablespoons extra virgin olive oil