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The math of Thanksgiving: a by-the-numbers guide to simplifying your holiday meal

Over the past 30 years, I've cooked more Thanksgiving feasts than I can count, both as a home cook and as a working chef. I've flambéed, brined and dry-rubbed the turkey. I've cooked for 50 and I've cooked for just me. I've catered, delivered and volunteered. I've done how-to videos and call-in radio shows. In a previous life as a cooking columnist at washingtonpost.com, I've counseled the most nervous of Thanksgiving newbies.

No matter how many folks you're hosting, or if it's your first time or your 10th, here's my two cents: Do the math.

It's the one guiding principle that I've learned after years of practice, and how I plan my Thanksgiving menus without a hitch (well, unless your oven goes kaput while the turkey is roasting, which did happen to me in 2008). Fire up those calculators!


Turkey


Turkey infographic

Information from Kim O'Donnel.

Oven temperature: Preheat the oven to 425 F. Roast the turkey at this temperature for 30 minutes. Reduce the heat to 350 for the remaining time.

Note: An oven thermometer is a handy way to test the accuracy of your oven. Look for one at your local hardware store.


Gravy


Gravy infographic

Information by Kim O'Donnel.

So for that party of six, 3 cups of gravy means:

— 6 tablespoons flour

— 6 tablespoons fat

— 3 cups of broth


Stuffing


Stuffing infographic

Information by Kim O'Donnel.

Note: Stuffing can be made in advance, but it must be completely cooled and refrigerated before it can go inside a raw turkey.


Stock


Also known as broth, stock is the foundation of flavor for the classic Thanksgiving sides. It truly is the special sauce, the thing that makes the gravy and stuffing zing.

The imaginary party of six needs 6 to 8 cups (about 2 quarts) of broth for gravy and stuffing.

If you buy a box or can of broth off the supermarket shelf, read the label for sodium. Salty broth makes for salty holiday sides.

Keep in mind that store-bought stock tastes like, well, not homemade.


How to Make Your Own Stock in Advance for the Big Day

Ingredients:

- 1 pound chicken feet OR 2 pounds combination of chicken backs and wings, rinsed and cleaned as need

- 1 large leek, thoroughly cleaned, root removed, and cut into 4-inch pieces (Plan B: 1 onion quartered, skin on plus 4 parsley stems)

- About 10 whole black peppercorns

- Enough cold water to cover, plus 2 inches (for this much chicken, about 8 cups)

Directions:

1. Place everything in a large pot. Bring up to a boil and with a slotted spoon, remove the foam that rises to the top. You'll notice that the foam is attracted to the chlorophyll in the leeks and parsley and works as a stock purifier.

2. Reduce the heat to medium-low, cover and cook at simmer for a minimum of 2 hours (and up to 4). The longer you cook the chicken parts, the deeper the flavor. Completely cool, strain, and refrigerate or freeze.

3. Makes about 2 quarts (8 cups).


Cranberry Sauce


Cranberry infographic

Information by Kim O'Donnel.

Despite what the internet tells you, it is not an all-day affair.


The Mechanics of Gravy


Once you've done broth calculations, get it good and hot in a saucepan and keep covered over low heat. Hot broth is vital for both gravy and stuffing.

You can always start with turkey drippings and make gravy in the same pan in which the turkey roasted. But if drippings are minimal, burned or overly salty (or you're making meatless gravy), use butter or oil.

Place flour in a small bowl. Add a ladleful of hot broth and whisk with a fork until the mixture is a smooth paste.

In absence of drippings, place butter or oil in a 10- or 12-inch skillet over medium heat, tilting the pan until the surface is coated. Add the flour mixture, stirring until completely incorporated. Let the roux cook for about 1 minute, until it bubbles.

Gradually add the hot broth to the roux, one ladle at a time, and let the gravy come to a gentle boil. Reduce the heat and cook at a gentle simmer. Feel free to season with fresh thyme and rosemary sprigs. The gravy should thicken pretty quickly. Season with salt and pepper before serving. Gently reheat.


Stuffing Guidelines


Whether you buy prepared bread cubes or make them yourself, they should be crisp and dry like croutons so that they more readily absorb the broth. To crisp, place cubes on a sheet pan and into a 200-degree oven until dried (but not burned), about 20 minutes.

As with gravy, get your broth good and hot in a saucepan and keep covered over low heat.

Here's when stores will open on Thanksgiving and Black Friday 2019 [update]

In a large skillet or pot that can accommodate your many cups of bread cubes, heat a few tablespoons of oil and sauté a handful or two of aromatics — things like chopped onion or leeks, celery, fennel, bell pepper, garlic. Whatever you decide, make sure the vegetables are around the same size so that they cook evenly. Cook until softened, 5 to 7 minutes. Gradually add the bread cubes, turning until coated with the aromatics. Add a hearty handful of finely chopped fresh herbs - parsley, sage, rosemary.

Ladle the hot broth over the bread cubes, waiting to add more until the liquid has been absorbed. Add liquid until you are satisfied with the moisture quotient — and remember, you can always add more, but you cannot take it away. Taste for salt and pepper, adding as needed. Maybe it needs a little heat with red pepper flakes or the perk of a few squeezes of a lemon half.

Pour the mixture into a greased casserole dish and bake in a 350 F oven until thoroughly warmed and a little crusty on top, about 30 minutes.

You can make stuffing in advance, cool and refrigerate, then bake on Thanksgiving.


Mashed Math


Estimate ½ pound potatoes per person. For a party of six, that means 3 pounds (about 7 medium potatoes).

Clean and peel as needed and cut into quarters. Place in a medium or large saucepan fitted with a lid.

Add just enough water to cover the potatoes and season the water with salt and whole cloves of garlic. For 3 pounds of potatoes, that means about 5 cups of water, 1 tablespoon of salt and 3 cloves garlic, peeled and left whole.

Cover and bring the potatoes to a boil. Lower the heat to medium and cook the potatoes until fork tender, about 25 minutes.

Transfer the potatoes and garlic to a large bowl, reserving the cooking water. With a handheld masher or large wooden spoon, mash the potatoes and add 2 to 3 tablespoons of olive oil, which both lubricates and seasons the hot potatoes. If potatoes seem dry, gradually ladle in some of the reserved cooking water. Season with black pepper and more salt as needed. (And of course, you can swap out the oil for milk or cream, but the key is to go gradually and taste along the way.)

Chef, cookbook author and journalist Kim O'Donnel joins LNP this month as its food writer. Her work has been featured in The Washington Post, USA Today and Civil Eats. Her most recent cookbook is "PNW Veg: 100 Vegetable Recipes Inspired by the Local Bounty of the Pacific Northwest."