Lentil Walnut Veggie Burger - Half Cup Habit

Ingredients

• 3 cups lentils, green (cooked, divided)
• 2/3 cups walnuts (toasted (see recipe notes))
• 1 medium onion (roughly chopped)
• 2 cloves garlic (peeled)
• 1 tsp salt
• 1/2 tsp pepper (black; freshly ground)
• 1 tbsp Worcestershire sauce (vegan)
• 4 ounces mushrooms (button or portabella; roughly chopped)
• 2 eggs ((see notes for plant-based substitute))
• 2 cups breadcrumbs (divided (see notes for gluten-free alternative))