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Superman's heat vision is a cool tool that allows him to project rays of energy (IR, X-Ray,or whatever the writers come up with) over an undefined range. He has used it for many great (and not so great) feats, including melting glaciers, shaving and leaving writings on walls.
There is one more use one can think of for such a versatile power: cooking! Has Superman ever used his heat vision to cook (not his enemies!) food?
There are two examples that I know of:
In the epilogue of Kingdom Come, the Trinity meets in a cafe. Bruce orders "Steak. Well-done.", but the steak he's brought is not even "a shade over medium". Instead of calling for a waiter, Clark decides to make himself useful for once:
In a deleted scene from Superman II (1980), with Christopher Reeve, titular hero uses his heat vision to cook a soufflé in his Fortress of Solitude:
In the (rightfully) maligned Superman IV, Superman and Clark Kent somehow end up on a sort of double date with Lois Lane and Lacy Warfied (played by Mariel Hemingway), at the latter's apartment. He has to distract the two women so he can change back and forth, and one way he does this is using his heat vision on the roast in the oven. It starts smoking, and Lacy runs to deal with it, finding it perfectly cooked when she pulls it out.
Here's a comic cover from the early 1960s. Another cover featured a one-shot character, Superman Junior, who roasted hot dogs with his xray vison as Superman (Sr.) chilled lemonade with his super-breath.
In Smallville episode 207 ("Lineage"), Clark uses heat vision to toast a slice of bread
In Smallville episode 420 ("Ageless"), Clark uses heat vision to warm a bottle of baby formula
