I have been on 8x F class EK flight with this menu now.

I have had the beef sliders a few times and the prawn cocktail.
The prawn cocktail was OK. Hit the spot.

The sliders were great. Though on one occasion the buns were really dry.
Actually I have noticed that there seems to be a variance with the beef sliders. Some times you get 'medium' sized buns (which seem to be drier buns) other times you get quite small buns (which always seem really fresh).
I often get the beef sliders as a main meal for my 4yo son. He enjoys them.

And on my most recent flight (DXB-AKL) we had a big breakfast in the lounge and I wasn't that hungry, so I had the caviar, then beef sliders as a main, then the tart for dessert. It worked out well.