Well, unfortunately, regular soy sauce is not gf.
Could you get gf Chinese food, maybe frozen, for Erin?
Ds used to eat at a Chinese restaurant in town that a friend of ours owned. Liu used to make him meals in a separate pan with no soy sauce.
You'd have to have a conversation with the chef. If they wouldn't cross contaminate with anything, would cook the food in a clean pan, and would understand that soy, noodles, etc. are gluten, then a good option is fried rice because of the lack of noodles, or something like beef/chicken with broccoli, pepper beef, etc. You can have them send rice, or make it on the side.
Actually, beef and broccoli is super easy to make if you or Josh felt like making her something, instead. I make mine with just thinly sliced meat and broccoli, salt, pepper, garlic powder, fresh ginger, and a little corn starch for the right consistency. There are soy sauces that have no gluten, usually best is tamari, but a few still do. But with label reading and perhaps writing to the company for a confirmation that there's no gluten in their product...!
I know how much you love walnut shrimp...mmmm!
Wintery tea sounds really good!
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