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I noticed a recipe that calls for adding the lemon juice after forming the emulsion of the eggs and oil, so looked like it isn't needed for that reason. It seem it's more for flavour and for helping it last longer. If you didn't't use the lemon, you'd probably need to pasteurise the eggs, and make just a small batch. Worth a try, if that's a food that would make life a bit more interesting for you both.

Thanks for that info its definitly worth trying have noted it down and may try it next weekend

thanks so much truly appreciated

Let me know how it goes.