Outdoor tiling

[dimstthomas]

I am building a brick bbq and want to use up some old kitchen tiles, by tiling part of the back of the bbq (well away from the grill). Will this work and is it best to use tile cement or brick cement?

Tile cement - looks better, but not designed for outdoors?
Brick cement - designed for outdoors, but difficult to use on a vertical surface?

Thanks