Ingredient

Beef stock

Roasted bones simmered long enough to draw out gelatine, which is what gives a good stock its body — a proper one sets to a wobble when cold. Most shop-bought versions have salt and colouring doing the work instead.

Sourcing
Chilled fresh stock in a tub beats cubes and cartons by a distance. If you use cubes, cut the salt elsewhere in the dish.
Varieties
Brown (roasted bones), White (unroasted), Bone broth, Concentrate
Quality cues
Homemade or good chilled stock sets to a jelly in the fridge. If it stays liquid, there is little gelatine in it.
Substitutions
Chicken stock, Vegetable stock, Mushroom stock
Storage
Refrigerate in a sealed container; freeze in portions or ice-cube trays for small amounts.
Shelf life
3-4 days refrigerated; 6 months frozen
Nutrition

Per 100 g

Calories
13 kcal
Protein
2 g
Fat
0.1 g
Carbs
1.2 g
Fibre
0 g
Sugars
0.5 g
Sodium
198 mg

From USDA FoodData Central (#172883). Raw, edible portion.