Pasta Kangkung Pesto

Bahan-bahan (6 porsi)

• 1 lb Semacam spageti ($1,49)
• 4 cups kale, chopped, loosely packed ($0.50)
• 1/3 cup olive oil, or as needed ($0.82)
• 1 large lemon (1/4 c juice, 1 Tbsp zest) ($0.75)
• 1 clove garlic ($0.08)
• 1/4 cup chopped walnuts ($0.57)
• 1/3 cup Parmesan, grated ($0.55)
• 1/2 tsp salt, or as needed ($0.03)
• Freshly cracked pepper to taste ($0.05)
• 4 oz . mozzarella (optional) ($2.00)