fussy vegetarian eater - how strict should I be?

[bellamom]

He is only six, and his repetoire is getting smaller and smaller - beans on toast and pizza is all he will eat without fuss! It is driving us all NUTS!

Is it too much to expect a boy to eat a bean stew with jacket pot, a nut roast, annabel karmel hidden veg sauce with spagetty,various veg soups etc without creating WW3?

I don't want to be a monster but it is getting ridiculous. Please any ideas????