Have fun with your sauce and add mint, basil, parsley or marjoram.
Try to use a really nice red wine vinegar, it really does make a difference.
You can serve the hollandaise hot, warm or even room temperature. Keep it warm in a preheated flask, it’ll be perfect for an hour.
Add the finely sliced spring onions to iced water and they’ll curl up and get really crunchy, same applies for radishes, chillies, and even herb leaves.