โญ Lime Juice and Coconut Milk (Best Gluten-Free Option)
1 tablespoon lime juice + 3/4 cup coconut milk per 1 cup buttermilkThis substitute works because lime juice introduces the necessary acidity that buttermilk would provide, which helps balance the sweet and salty flavors in Pad Thai. Coconut milk adds a subtle creaminess and a slight sweetness, mimicking the texture of buttermilk without dairy.
For best results, mix the lime juice into the coconut milk and let it sit for 5 minutes to allow curdling, which creates a texture closer to buttermilk. Use fresh lime juice to avoid bitterness.
Compared to buttermilk, this substitute maintains the bright, tangy profile essential to Pad Thai while adding a hint of tropical richness that complements the dish's Southeast Asian roots.