Prep Time 15 minutes mins
Cook Time 10 minutes mins
Total Time 25 minutes mins
Blot the roasted peppers dry before blending to keep the sauce silky. Always grate Parmesan from a block, and stir it in off the heat to avoid clumps. The sauce keeps in the fridge for up to 4 days or freezes for 2 months; reheat gently with a splash of milk or broth. For a dairy-free version, use full-fat coconut milk, dairy-free butter, and plant-based Parmesan.