Start by heating 1 tablespoon of extra virgin olive oil or avocado oil in a large pot over medium heat. Once hot, add the diced onion and sauté until it becomes translucent, about 3-4 minutes. Stir in the chopped garlic, ginger, and lemongrass (if using), cooking for another minute until fragrant.
Add in 4 tablespoons of Thai red curry paste and stir well to combine with the aromatics. Allow this mixture to cook for about 2 minutes.
Pour in 3 cups of chicken broth along with a can of creamy coconut milk. Stir everything together and bring it to a gentle simmer.
Add in 2 teaspoons of fish sauce and 2 teaspoons of sugar. Stir and let it simmer for about 5 minutes.
Add your frozen dumplings and let them cook according to package instructions, typically around 6-8 minutes.
Stir in 1 cup of chopped spinach and let it wilt for just a minute or two.
Ladle your curry dumpling soup into bowls. Garnish with sliced green onions, chopped cilantro leaves, and a squeeze of lime.