Put everything but the butter into a jar that just fits the head of your immersion blender. There should not be too much room to spare. This is important because it allows the blender to concentrate its blending power for the perfect emulsion.
Melt the butter in a small saucepan.
Put the head of the blender on the bottom of the jar and blend briefly just to combine everything. Then, with the blender going, drizzle the hot melted butter into the jar, wiggling the blender up down and around to get everything evenly blended. Once all the butter is in give it a final blend just to make sure its all thick and glossy.
Taste your sauce to adjust the seasonings, if needed.
The sauce can be used right away: Béarnaise sauce is usually served warm or at room temperature. It can also be refrigerated and gently reheated for later.
Notes
*please note that this recipe includes raw egg yolks. Consuming raw or undercooked eggs may increase the risk of food borne illness, particularly for people with weakened immune systems, young children, pregnant women, or the elderly. It is recommended to use pasteurized eggs or consult with a healthcare professional before consuming raw eggs
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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