In a splash of oil, sauté garlic, ginger and lemongrass until fragrant on medium high heat.
Add mushrooms and allow to cook undisturbed for at least 5 minutes.
Stir mushrooms and then add fish sauce, brown sugar, and Thai chilis.
Sauté for an additional 5-10 minutes until mushrooms have softened and are covered in sauce.
Turn off heat, allow to cool for a few minutes and then toss in fresh basil.
Service with rice and some chili oil!