Yes, the ham once prepared I add it to the scrambled eggs, I add them so that they cook again with the egg and the flavors join.

I don't know the Dijon mustard that you comment on (my culinary knowledge isn't that great), but it sounds great, since I like strong flavors.

As for the idea of onions, I also think it would be a good combination, I had never thought about it, as soon as I have the opportunity I will do it.👍