Gather all ingredients before starting the recipe.
Heat 1 tbsp vegetable oil in a medium saucepan over medium heat.
Add 1 medium shallot, finely chopped and sauté until the shallots are soft, about 3-4 minutes.
Add 1 clove peeled garlic, grated, 2-3 tbsp prepared green curry paste, 1 tbsp fish sauce and 1 tsp grated lime zest and stir to combine. Cook until the mixture becomes quite fragrant, about 4 minutes.
Add 1 14 oz can coconut milk, stir to combine with a whisk, bring to a simmer and then reduce heat and cook until reduced by half, about 20-25 minutes. Remove from heat and allow the sauce to come to room temperature.
Add 1 tbsp agave or honey 1 tbsp fresh lime juice and 1/2 bunch fresh cilantro leaves and blend until very smooth.
Drizzle sauce over the bottom of a serving platter, place sliced pork tenderloin on top of the sauce and garnish with chopped pistachios and cilantro leaves.