How to Say "bouillon" in Spanish
The Spanish word for “bouillon” is “caldo” — A1 level. This is a very common word in everyday Spanish.

Examples
Si estás enfermo, toma un poco de caldo de pollo.
If you are sick, have some chicken broth.
Para hacer la paella, necesitas un buen caldo de pescado.
To make paella, you need a good fish stock.
El secreto de la sopa es el caldo que preparamos ayer.
The secret to the soup is the broth we prepared yesterday.
It's a masculine noun
Even though many words for food are feminine, 'caldo' is masculine. Always use 'el' or 'un' with it (el caldo, un caldo).
Mass Noun behavior
Just like in English, we usually don't count 'caldo' (one broth, two broths). We use quantities like 'un poco de caldo' (a bit of broth) or 'una taza de caldo' (a cup of broth).
Caldo vs. Sopa
Mistake: “Saying 'caldo' when there are noodles or vegetables inside.”
Correction: Use 'caldo' for just the liquid. If it has solids like pasta, rice, or veggies, call it 'sopa'.
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