Combine the grapeseed oil and the bonito flakes in a small saucepan and cook over low heat until the oil reaches 180 degrees F. Remove from the heat and cool at room temperature for 20 minutes before straining through a fine mesh sieve. Reserve the bonito flakes for another use (see Cook's Note).
Whisk the egg yolks together with the lemon juice, rice wine vinegar, and salt in a large bowl. Whisk briskly, then add the oil a few drops at a time until the egg mixture thickens and lightens in color a bit. Then, still whisking briskly, increase the oil flow to a constant, thin stream until a smooth mayonnaise texture is achieved.
Cook’s Note
I use these flakes on pizza, in scrambled eggs, on toast and with Manchego cheese, which sounds like it shouldn't be good but totally is.
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Consumption of raw or undercooked eggs, shellfish and meat may increase the risk of foodborne illness.
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