Do tamari pumpkin seeds contain soy, gluten, yeast, or whey?
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Depends on how the tamari is made because tamari can have all these things in them unless otherwise stated.
Tamari sometimes contains wheat and always contains soy. Flavored seeds/nuts often use whey or other dairy products to make the flavor stick better and yeast could be used to heighten the glutamate level to make them taste more/better.
You can try making your own flavored nuts/seeds by buying raw nuts/seeds and roasting them (about 325 until they're crispy) after coating them with a little olive oil and whatever other flavorings you like (salt and pepper, vinegar, sesame oil and salt, etc).