What can't you boil down?

What cannot be boiled down or only to a limited extent?

• Products containing gluten, as it would otherwise ferment (e.g. wheat, spelt, oats)
• Vegetable broth containing gluten
• Fresh parsley and freeze-dried parsley. Both still contain bitter substances. This makes the food bitter
• Vegetable stock with parsley (if not powdered)
• Milk and dairy products (including butter)
• Seafood
• nuts
• Products containing carboxymethyl cellulose (methyl cellulose can be boiled down, but carboxymethyl cellulose cannot)
• Tying aids for roulades etc. such as yarn, clips or needles
• Bay leaves can be cooked, but must be removed from liquid dishes before cooking. (otherwise everything will taste extremely like bay leaf afterwards). For solid dishes (e.g. pork in its own juice), the bay leaf can be placed at the bottom of the jar.
• Oil (becomes rancid over time)
• Bones and cartilage (remove before cooking)
• Smoked over coniferous wood
• Pectin, as it becomes liquid again
• E466 (obtained from coniferous wood)

Exception:

Milk and dairy products as well as flour can be cooked in solid masses (e.g. cakes) (1.5% UHT milk). Gluten can also be boiled down in solid baked masses, such as in a cake. It is then inactivated (baked to death, so to speak) and does not ferment. Cakes can therefore be cooked (30 minutes at 100 degrees).

What can be used instead?

• Gluten-free starches (based on corn, rice, potato or manioc starch)
• Dried parsley
• Iodized salt (note, some people don't like the taste afterwards, others don't notice any difference) (only not usable during fermentation)
• Stock cubes (without barley malt extract)
• Cereal-based flavorings (e.g. wheat flavoring, yeast extract)
• "may contain traces of..."
• clarified butter
• Gluten-free vegetable stock (if it is not a powder, then without parsley)

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Cover picture by Alexei on Pixabay.