If you burn something, that means you charred it unintentionally. Something like noodles, cake, etc. that you don’t want that type of flavor involved in. You can also burn foods you do normally char (like meats or peppers) but that requires basically going too far with the char. It revolves around the flavor of the food and how it changes when that happens (this is also excluding the smoky flavor you may get from say a wood grilled char).
Ultimately two different words that mean the same thing, but in different flavor contexts. A bit of char on a marshmallow or a bell pepper is good, a bit of char on your lasagna is not good.
Charing removes organic compounds leaving behind the charcoal. This is done by heating up organic material to a burning temperature without the presence of oxygen. Charred material lights very easily from a spark so it is highly prized for outdoors and survival situations.
Burning on the other hand converts the carbon to carbon dioxide while burning off the organic compounds. In the end you left with ash. The ash however is still useful. It can be mixed into compost or directly into garden beds to add minerals (phosphorus, potassium, etc). As well it can mixed with water to create a lye mixture that can then be used to create soaps.
When you char a steak your burning off some of the grease and oils from the meat and other products you added. This performs two tasks, it seals in the moisture by creating a crust on the surface of the meat. This gives you juicier meat, and holds the flavors in. As well the slight charing concentrates the flavors of the meat, seasonings or sauces supplied. Over all giving you a more flavorful meal.
Burning however you lose moisture because as it burns it opens up the fibers in the meat and boils it off. As well burning releases acids into the meat, causing the sour flavors you get (charring does as well, but the amount released is very small). The loss of moisture and acids also toughens the meat making it unpalatable.
Char is usually present only in very small quantities if you want to add a bitter or smoky flavor to something. It’s always done at very high heat for a very short time (like on a grill) so you will have a lot of good non-char food with a little crust of char on the outside. If something is burnt, there’s too much char and the bitter/dry/smokiness takes over.
Keep in mind though almost no dishes use char. Like a charred steak is generally overdone. What you’re usually looking for is an even layer of browning (shiny and dark caramel colored) rather than char (matte black like charcoal). Browned flavors are sweet and savory rather than bitter and smoky.
at high temperatures, low moisture and high protein/sugar environments, caramelization and/or browning from the maillard reaction happens. complex compounds are created which smell and taste amazing.
if you cook fat over coals and it partially combusts creating smoke and it gets on the food, also amazing.
none of these are charring. even if completely black, a 24h brisket or a 3week black garlic are not charred. they have maillard reactions.
charring is carbonization of all your delicious carbs, fats and proteins. complete reduction to simple ash compounds that taste bitter and disgusting. if you actually char your food it will taste bad, no exceptions.
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