The best replacement for hollandaise is bearnaise.

The best alternatives to hollandaise are rated as following:
★★★★★  bearnaise
★★★  bernaise
★★  bernaise sauce
★★  mayonnaise
★  bearnaise sauce
★  aioli
  sabayon

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Speaking about hollandaise, one probably shouldn't forget about asparagus.

Other search terms related to hollandaise and their ratings are:
★★★★★ asparagus
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