Frugal Kitchen · October 7, 2026 · 7 min read

How to Stretch Ground Beef: 6 Add-Ins, the Ratios That Work and the One Temperature That Matters

Stretch a pound of ground beef with beans, lentils, mushrooms, oats or grated vegetables. Ratios for each, real cost math from August 2026 prices, and USDA's 160°F rule.

Brown the beef first, drain it, then fold in something cheaper that soaks up the same seasoning: cooked beans or lentils, finely chopped mushrooms, rolled oats, or grated vegetables. Cook the beef to 160°F, the safe minimum USDA sets for ground beef. Done this way, one pound of beef can fill twice as many tacos or bowls of chili, and the dish tastes like it was meant to be made that way.

Here's how much of each add-in to use, which dishes each one suits, and what the math looks like at current prices.

Why it's worth doing

In August 2026, the Bureau of Labor Statistics' U.S. average price for ground beef (100% beef) was $6.92 a pound. Dried beans averaged $1.63 a pound. That gap gets wider once you cook both.

Ground beef shrinks in the pan as fat and water cook out. Using USDA FoodData Central figures for 80/20 ground beef, protein goes from 17.2 g per 100 g raw to 27 g per 100 g cooked, which means a pound of raw beef ends up as roughly 290 g (about 10 oz) of browned crumbles. Dried beans go the other way. Black beans have 341 calories per 100 g dry and 132 per 100 g cooked, so cooked beans weigh roughly two and a half times what they did dry.

Put those together and, at August 2026 prices, cooked ground beef costs about $2.40 per 100 g, while home-cooked black beans cost about $0.14 per 100 g.

The math on one pound

Say you brown 1 lb of beef and stir in 2 cups of cooked black beans (about 344 g, made from roughly 4.7 oz of dried beans that cost about $0.48).

All beef Beef plus 2 cups beans
Cooked filling about 288 g about 632 g
4-oz portions about 2.5 about 5.6
Cost per 4-oz portion about $2.72 about $1.33
Calories per 4-oz portion about 308 about 222
Protein per 4-oz portion about 31 g about 19 g
Fat per 4-oz portion about 20 g about 9 g
Fiber per 4-oz portion 0 g about 5 g

Nutrition figures come from FoodData Central entries for cooked 80/20 crumbles and cooked black beans. Each blended portion has less protein than an all-beef portion, but you get more than twice as many portions, more fiber and less fat. Use the price-per-serving calculator with your own store's prices to see where your break-even falls.

Which ground beef to buy for stretching

BLS tracks three kinds of ground beef. In August 2026 the U.S. averages were $6.92 a pound for regular ground beef, $6.77 for ground chuck and $8.57 for lean and extra-lean. Lean beef loses less weight in the pan, but not enough to close that price gap. Using FoodData Central's 90/10 figures as a stand-in for lean beef, a pound cooks down to about 320 g, against about 290 g for 80/20. That works out to roughly $2.69 per 100 g of cooked lean beef versus $2.40 for regular.

For stretching, the cheaper, fattier beef usually makes more sense. You'll drain off much of the fat after browning, and the beans, lentils or oats you add bring the volume. Save lean beef for dishes where you can't pour off the fat, such as meatloaf.

The six add-ins, with ratios

These ratios are starting points. Go lighter the first time if your household is skeptical, then push it further.

1. Cooked lentils

Ratio: up to 1 cup cooked lentils per pound of raw beef in tacos and sloppy joes; up to 1 1/2 cups in chili or pasta sauce.
Best in: anything with a sauce. Brown or green lentils hold their shape; red lentils melt into sauces.
Nutrition note: per 100 g cooked, lentils carry about 9 g of protein and 7.9 g of fiber (FoodData Central). BLS doesn't track a separate average price for lentils, so check your shelf.

2. Cooked beans

Ratio: 1 to 2 cups per pound. Black or pinto beans for tacos and burritos, kidney beans for chili.
Best in: big-batch chili, burrito bowls, nachos. Mash a third of the beans so they cling to the meat instead of rolling around the pan.
Nutrition note: cooked black beans have about 8.9 g protein and 8.7 g fiber per 100 g.

3. Mushrooms

Ratio: 1 part finely chopped mushrooms to 3 parts beef by weight, up to half and half.
Best in: burgers, meatballs, meatloaf, bolognese. Chop them close to the size of the browned beef so they disappear.
Why that ratio: the James Beard Foundation's Blended Burger Project asked participating restaurants to use at least 25% mushrooms in their burgers. That quarter-share is a good proof of concept for home cooks. White button mushrooms run about 22 calories per 100 g raw.
Tip: cook the mushrooms until their liquid evaporates before mixing them into anything you're shaping into patties.

4. Rolled oats

Ratio: 1/2 cup per pound for meatloaf and meatballs; 1/3 cup for burgers.
Best in: anything you shape. Oats bind the mixture and hold on to juices that would otherwise end up in the pan.
Tip: soak the oats in a few tablespoons of milk or broth for five minutes first so they don't stay chewy.

5. Grated vegetables

Ratio: about 1 cup grated carrot, zucchini or onion per pound.
Best in: meat sauces, sloppy joes, shepherd's pie filling.
Tip: squeeze grated zucchini in a towel before adding it, or your sauce turns watery.

6. Rice or other cooked grains

Ratio: 1 cup cooked rice per pound.
Best in: stuffed peppers, cabbage rolls, burrito filling and meatballs in soup.
Tip: day-old rice mixes in more cleanly than fresh rice, which can turn gluey. Chill cooked rice within two hours, the same rule as any leftover.
Cost note: long-grain white rice averaged $1.11 a pound in August 2026 (BLS). It nearly triples in weight as it cooks (365 calories per 100 g raw versus 130 cooked, per FoodData Central), so cooked rice costs under 9 cents per 100 g.

Recipes that take an add-in well

  • Tacos: our budget tacos handle a 50/50 mix of beef and mashed pinto beans without complaint. Season after mixing so the beans get the spice too.
  • Chili: the easiest place to start. Most people won't notice an extra can of beans or a cup of lentils.
  • Spaghetti sauce: grated carrot and finely chopped mushrooms vanish into a long-simmered sauce.
  • Meatballs and meatloaf: oats plus mushrooms is a reliable pair.
  • Burgers: start at 25% mushrooms and see how your household reacts before going higher.

Food safety for blended meat

Cook to 160°F. USDA's Food Safety and Inspection Service lists 160°F as the safe minimum internal temperature for ground beef, measured with a food thermometer. Color isn't a reliable test, and that matters more with blends, because mushrooms and beans change how the mixture looks. Check the thickest part of a patty or meatloaf.

Store raw beef cold and use it quickly. FSIS advises refrigerating raw ground beef at 40°F or below and using it within one to two days, or freezing it.

Thaw it safely. If you buy beef on sale and freeze it, FSIS lists three safe ways to thaw: in the refrigerator, in cold water or in the microwave. Never thaw it on the counter. Ground beef thawed in the fridge can stay there another day or two before cooking; beef thawed in cold water or the microwave should be cooked right away.

Leftovers: refrigerate within two hours and eat within three to four days. A blended chili freezes well in single portions.

When stretching doesn't work

Some dishes rely on the meat itself: a simple smash burger, or any recipe where browned beef is the whole point. For those, buy less beef and serve a bigger side instead. Stretching works best where sauce and spice are doing most of the talking.

Want a weekly plan built around tricks like this? Palate Plus is where we're putting them together.

Sources

Cost-per-100 g and yield figures above are our calculations from the BLS prices and FoodData Central values listed, not published figures.

By The Penny-Wise Palate Editorial Team · Taciturn Studios LLC