– 1 tbsp olive oil – 1 onion, chopped – 1 2 inch piece of ginger, peeled and thinly sliced or shredded – 1 tbsp red curry paste – 1 1/2 lbs usually 3-4 sweet potatoes, peeled and cubed – 3 cups chicken or vegetable broth – 1 15 oz can coconut milk – 3 tbsp lemon juice – 1 tsp salt – Cilantro or parsley, for serving (optional)