My family eats a lot of stir fries and sesame oil is a critical ingredient in many of them. Unfortunately, my wife is allergic to sesame so we need an alternative. Has anyone had success recreating the sesame oil flavor with a non-sesame-based food?
Sesame oil has such a distinctive flavour, I'm afraid there's nothing that will give you exactly the same taste. Many sites suggest peanut oil, but this is more or less tasteless in my experience.
I would suggest toasting some unsalted peanuts or cashews and adding them to the stir fry, to get that roasted, slightly smoky flavour. Just add them to a warm, dry pan and toss frequently to prevent burning.
If you're feeling really adventurous you might even try smoking some peanuts (you can do this in a wok with certain wood chips and a bamboo steamer, plenty of instructions online).
I have this issue, as my son is very allergic to sesame, and also to peanuts and basically all tree nuts (precluding the nut-based suggestions above). When I make fried rice I like to use chopped-up pancetta at the appropriate point in the recipe (give it enough time to render much of its fat). No, it's not a match, but it seems to fill a somewhat comparable role in the flavor, perhaps because of the smokiness. You could probably substitute bacon if you lack pancetta.