Panang curry is one of my favorite types of Thai curries. It is deeply flavored with spicy chili paste, hints of lime, and a nutty richness from the peanut butter. It is best to find a good quality panang curry paste for this recipe. Look for one at your local food co-op or health food store. Panang curry paste is typically made from Thai red chilies, shallots, lemongrass, garlic, coriander, galangal (Thai ginger), kaffir lime peel, cumin, and sea salt. If you would like more protein, feel free to add some cubed tofu, cooked chickpeas, or cubed halibut to the curry. If adding fish, add it when you add the broccoli and zucchini as it only takes a few minutes to cook.