Creamy Vegan Zucchini Basil Pasta with Lemon

Name: Creamy Vegan Zucchini Basil Pasta with Lemon
Cuisine: Italian
Ingredients: 1/2 onion - finely diced; 4 cloves garlic - minced; 2 medium or 4 small zucchinis - roughly chopped; 3 tbsp nutritional yeast; 1/4 cup reserved pasta water; 3/4 cup plant milk; 1/4 cup cashew butter (can sub tahini if allergic); 1 cup basil; juice from 1/2 lemon; pepper to taste