booja booja vegan "ice cream" is the best on earth much better than swedish glace. It's a bit more exspensive but i think well worth it!! should be able to get it in good health food shops. The chocolate is my fave but i warn you stay away from the t...
Actually I dont know where to buy it fresh, but Knorr makes a good demi-glace in a pack. Just follow the directions.
I've bought them in Waitrose before Found a recipe, if you want to make your own