Vietnamese Chicken Pho Broth Base, Frozen in Quarts

Why it works

Charring the ginger and onion before they go into the pot is what gives this broth its color and edge: browning builds savory compounds, so the finished broth needs less added salt to taste complete than one built on bouillon and MSG, the way many restaurant and packaged versions are. Hours of gentle simmering pull gelatin from the chicken bones and cartilage, mostly the amino acids glycine and proline, which round out the muscle protein in the sliced chicken added at serving time, and the combined protein across broth, chicken, and noodles is also why a bowl fills you up, since protein has a stronger effect on fullness signaling than either carbohydrate or fat. Getting enough protein at regular meals across a week is one of the sturdier findings in the healthy-aging literature: adequate intake slows the muscle loss that tracks with frailty risk later in life, and a freezer stocked with a protein-dense broth base makes that easier to manage on an ordinary Tuesday. Glycine itself has drawn newer interest in aging research through animal studies on methionine restriction and lifespan extension, though that work is still confined to rodents and nowhere near settled in people. Chicken soup's folk reputation has some real backing: small laboratory studies have found it can slow the movement of neutrophils, the immune cells whose activity drives cold congestion, though that is lab-dish evidence rather than a clinical trial showing a shorter illness, and the ginger and warming spices here follow the same culinary tradition rather than a separately proven remedy of their own.

Ingredients

• 2 kg (about 4½ lb) chicken wings, backs, and drumsticks (or one whole chicken, cut into parts)
• 1 large yellow onion, halved
• 100 g fresh ginger (one large knob), halved lengthwise
• 6 whole star anise
• 1 cinnamon stick
• 4 whole cloves
• 1 tbsp coriander seeds
• 1 black cardamom pod (optional)
• 3 tbsp fish sauce, plus more to taste
• 1 tbsp rock sugar or light brown sugar
• 1 tsp salt, plus more to taste
• 4 litres water, plus more to top up while simmering
• For each weeknight bowl: 90 g dried flat rice noodles, a handful of bean sprouts, torn Thai basil and cilantro, sliced scallion, lime wedges, and sliced red chili

Method

1. Char the onion and ginger under a broiler or directly over a gas flame, turning occasionally, until the skins blacken in spots, about 8 minutes, then rinse the charred skin off under running water. This step is what gives the broth its color and edge; skip it and the broth tastes flat.
2. Add the onion and ginger to a large stockpot with the chicken wings, backs, and drumsticks, and cover with the water. Bring to a boil, then skim off the grey foam that rises over the first 10 minutes, since that is coagulated protein and skimming it is what keeps the broth clear rather than cloudy.
3. Toast the star anise, cinnamon, cloves, coriander seeds, and cardamom in a dry pan for 2 minutes until fragrant, then add them to the pot along with the fish sauce, sugar, and salt.
4. Lower the heat to a bare simmer, partially cover, and cook for 3 hours, topping up water as needed to keep everything covered. Pull the drumsticks out after 45 minutes if you want intact meat for bowls rather than letting it fall apart in the pot, then shred it once cool and refrigerate separately from the broth.
5. Strain the broth through a fine sieve and discard the solids, then taste for salt and fish sauce. Cool the pot in a sink of cold water, then portion into quart containers, leaving an inch of headspace since the broth expands as it freezes.
6. On a weeknight, thaw a quart of broth and bring it to a simmer while dried rice noodles soak in hot water until pliable, about 10 minutes. Divide the noodles between bowls, ladle over the hot broth and shredded chicken, and top with bean sprouts, torn herbs, scallion, lime, and chili.