Sanitize all work areas, cutting boards, equipment and sinks used in the preparation of this recipe.
Combine yolks and vinegar into a cambro (for use with an immersion blender) or into a vitamix blender.
Blend, while constantly attended, until thoroughly combined and smooth.
Add spring onion tops and bottoms and Water.
Blend, while constantly attended, until thoroughly combined and smooth.
While blending, form a swirling vortex and add canola oil in a thin steady stream until all oil is incorporated and fully emulsified.
Season with salt. Taste and adjust seasoning as needed.
Transfer to clean food storage containers. Cover, label, date and store refrigerated.
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