Step 1

Combine the grapeseed oil and the bonito flakes in a small saucepan and cook over low heat until the oil reaches 180°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.I use these on pizza, in scrambled eggs, and on toast and with Manchego cheese.

Step 2

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.