Questions & Answers about El muslo está jugoso.
Spanish often uses estar for a state or condition, especially when talking about how food turns out after cooking.
So está jugoso means the thigh is juicy in the sense of its current texture or result.
Using es jugoso would sound more like describing an inherent or defining characteristic, which is much less natural here.
With food, Spanish commonly says things like:
- La carne está tierna = The meat is tender
- El pescado está seco = The fish is dry
- El pollo está delicioso = The chicken is delicious
So in this sentence, está is the normal choice.