Any firm-fleshed white fish can be substituted in this simple but elegant dish, but it needs to be firm - these types of fish roast best. If the butter hardens in the hollandaise stir it gently over the pan of simmering water again until it just softens; be careful because it will split if it gets too warm.
Note Clarified butter is made by melting chilled diced butter over low heat until the yellow fat separates from the white milk solids. Pour off the clarified fat and discard solids; 300gm butter yields about 200ml clarified butter.
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