โญ Plain Kefir (Best Gluten-Free Option)
1 cup kefir per 1 cup buttermilkKefir is a fermented milk product with a natural acidity and slightly effervescent quality similar to buttermilk. Its live cultures contribute to a tangy flavor and can help maintain the desired sauce texture by preventing curdling.
Use plain, unsweetened kefir to avoid altering the pasta's flavor profile. Because kefir is slightly thinner than buttermilk, it integrates smoothly into sauces.
The final pasta dish will have a comparable tang and creaminess, with a subtle probiotic benefit, making it a close match to buttermilk in both taste and function.