That’s a good point actually… whenever you see them in any UK supermarket it tends to just be egg mayo by itself (and always on brown bread for some reason). Or egg & cress like you say.
OR you might see an all day breakfast sandwich with egg mayo, sausage and bacon.
One of these
In the UK at least, the filling is called egg mayonnaise. In the US/Canada it seems to be called egg salad
Tbf there being lettuce in there is somewhat unconventional in the UK
If there’s any greenery it’s often cress
Though that’s now an egg & cress rather than an egg mayo
That’s a good point actually… whenever you see them in any UK supermarket it tends to just be egg mayo by itself (and always on brown bread for some reason). Or egg & cress like you say.
OR you might see an all day breakfast sandwich with egg mayo, sausage and bacon.