Carbonizar aromáticos
Técnica vietnamita fundacional: carbonizar jengibre, cebolla y chalota a fuego abierto. Crea el dulzor ahumado profundo que define el pho y muchos caldos.
Select aromatics
Use old ginger (more fibrous, more flavour) and large brown onions. Do not peel — the skin chars and adds colour to the broth.
Tip: Restaurant trick: split ginger lengthways to expose more surface area.
Open flame char
Place aromatics directly on the gas burner grate at maximum heat. Rotate every 2 minutes using tongs until blackened on all sides.
Tip: The char should be aggressive — 60-70% blackened surface. This is not a gentle toast.
Rinse and add
Briefly rinse charred aromatics under cold water to remove loose ash. Add directly to simmering broth.
Tip: Do not scrub — you want the char layer intact.
Oven method
If you don't have a gas stove, place halved ginger and onion cut-side down on a foil-lined tray. Broil on high for 10-12 minutes until well blackened.
Tip: Keep the oven door slightly ajar to prevent steam buildup.
Torch method
A kitchen torch works well for smaller quantities. Char evenly, rotating the aromatics as you go.
Add to broth
Rinse lightly and add to your broth pot. The smoke flavour will develop over the first hour of simmering.