I'm just doing a recipe which asks for rapeseed oil and black mustard seeds. As I haven't got either, I've substituted sunflower oil and brown mustard seeds. So far, so exciting, but what I'd be interested to know is if posters could tell the difference. I enjoy trying new recipes, but if I followed them to the letter, I'd have loads of different oils. As it is, I just have olive and some form of vegetable oil.
Can you tell the difference between different vegetable oils?