Restaurant language lessons from Andrew Coppolino

Like any industry, restaurants have a specialized vocabulary or jargon.
While waitstaff may tell you that they have run out of that night's truffled mac and cheese special, the kitchen refers to not having anymore as "86-ed."
Here's a select list of words, that you might find on a restaurant menu, what they mean and a bit of their history.
Meat & cheese
At the Charcoal Steak House, enjoy a Wagyu steak (an uber-premium Japanese breed of cattle) with a demi-glace, which is a reduced sauce thick enough to coat the back of a spoon.
Stock (like a broth) that is on its way to being reduced to glace de viande ("meat ice or meat glass") is a demi-glace when it's half-way there. (The wagyu and demi, by the way, is $149 for 14 ounces.)
You will find salumi on charcuterie boards at Proof in Waterloo. It has echoes of salami and so it should: it's the huge range of Italian cured (usually pork) meats. Sure, call them cold cuts.
La Cucina Kitchener serves burrata: mozzarella cheese formed into a "pouch" and filled with even more cheese (traditionally stracciatella di bufala) and cream. Wildcraft wraps theirs in prosciutto. It's a heavenly appetizer.
Mayo-li
Two terms that have (wrongly) become conflated and which appear just about everywhere are mayonnaise and aioli. The former is made by whipping oil into an egg yolk; the latter is a Provençal condiment made by whipping together garlic paste and lots of olive oil.
Note: taking a teaspoon of chopped garlic and stirring it into Hellmans does not an aioli make.
Regardless, neither of the above could be done without an emulsion, a term sometimes used as a fancy-pants word for sauce. An emulsion is the result of beating together two liquids that don't want to go together. Put some oil and vinegar in a jar and they want to stay separate; shake vigorously and add some seasoning and you have a vinaigrette.
Cooking
On many menus, confit will appear: it's both an ancient meat preservation technique and a dish that is perhaps most often seen as duck confit.
Time was, you submerged a duck leg in fat and cooked it in the oven. It was stored in the fridge buried in the fat and then cooked in a hot pan so it's crispy and tender. Recently, chefs are cooking vegetable confit: submerged in good olive oil, veg like parsnips, onions, green beans and carrots are cooked low and slow in the oven.
Crudo