On: Covariance and Contravariance

[DonaldFisk]

No, just botanically.

You can't make jam from tomatoes. Or at least it wouldn't be called jam. You can make jam from rhubarb, so in some sense that is a fruit.

Similarly, you can make soup out of tomatoes, but not out of rhubarb.

So, from the point of view of a cook, tomatoes can be considered vegetables and rhubarb fruit.

[maxerickson → DonaldFisk]

There are recipes out there for rhubarb soup and tomato jam (nothing fancy, just search on either term).

[DonaldFisk → maxerickson]

There's also strawberry soup (http://www.food.com/recipe/strawberry-soup-122037) and carrot jam (http://www.foodandwine.com/recipes/carrot-jam).

I think we need fuzzy classes. :-)

[jacquesm → DonaldFisk]

Tomato jam I haven't seen but there is Tomato Chutney (and yes, it's sweet).