El solomillo está muy tierno.

Because solomillo is a singular masculine noun in Spanish, so it takes the masculine singular definite article el.

• el solomillo = the tenderloin / the sirloin steak depending on context
• If it were a feminine noun, you would use la instead.

Spanish usually uses articles more often than English does, so El solomillo está muy tierno sounds natural where English might simply say The steak is very tender or just It’s very tender if the context is clear.

In Spain, solomillo usually refers to a prime, tender cut of meat, especially tenderloin. In restaurant contexts, it can often mean a fillet steak or beef tenderloin, though the exact English translation can vary a bit depending on the animal and the menu.

So even if your translation says sirloin or steak, the key point is that solomillo refers to a high-quality, tender cut of meat.

This is one of the most common questions in Spanish.

Here, está is used because tierno describes the current condition or state of the meat: how it is right now, for example after being cooked.

• estar is often used for states, conditions, and results.
• ser is more often used for essential characteristics or classification.

So:

• El solomillo está muy tierno = the meat is tender at the moment / in this preparation
• El solomillo es... would sound more like you are defining what tenderloin is in general, which is not the idea here

With food, estar is very common for texture, temperature, or doneness:

• Está caliente = it’s hot
• Está frío = it’s cold
• Está jugoso = it’s juicy
• Está tierno = it’s tender

Because tierno has to agree with solomillo, which is a masculine singular noun.

Spanish adjectives usually agree in gender and number with the noun they describe:

• masculine singular: tierno
• feminine singular: tierna
• masculine plural: tiernos
• feminine plural: tiernas

Examples:

• El solomillo está tierno.
• La carne está tierna.
• Los filetes están tiernos.
• Las piezas están tiernas.

Muy means very, and it normally comes directly before an adjective or adverb.

So:

• muy tierno = very tender

This is the standard position in Spanish:

• muy bueno = very good
• muy caliente = very hot
• muy jugoso = very juicy

You cannot say tierno muy here.

This is the normal and most neutral word order:

subject + verb + adverb + adjective

• El solomillo = subject
• está = verb
• muy tierno = description

Spanish word order is sometimes flexible, but this sentence is the most natural standard version. Other orders are possible only in special contexts for emphasis, but a learner should stick with:

El solomillo está muy tierno.

Yes, if the context is already clear.

Spanish often omits things that are obvious from the situation. For example, if everyone is already talking about the steak, a waiter or diner could simply say:

Está muy tierno. = It’s very tender.

But if you want to name the dish clearly, especially as a full sentence for practice, El solomillo está muy tierno is better.

A Spain Spanish pronunciation guide would be roughly:

so-lo-MEE-yo

Key points:

• The stress falls on -mi-: soloMILLo
• In most of Spain, ll is pronounced like y in yes
• So solomillo sounds roughly like so-lo-MEE-yo

A more phonetic approximation:

• so as in so
• lo as in low
• mi like me
• llo like yo

Yes, tierno can describe people as well, but the meaning changes with context.

With food:

• tierno = tender

With people, animals, or behaviour:

• tierno can mean tender, sweet, affectionate, or cute/adorable

Examples:

• La carne está tierna. = The meat is tender.
• Es un niño muy tierno. = He’s a very sweet/affectionate child.
• Qué tierno. = How sweet / How cute.

So in your sentence, because the subject is solomillo, the meaning is clearly about texture.

Yes, absolutely. It sounds natural in Spain Spanish.

When talking about cooked meat, Spaniards commonly use adjectives like:

• tierno = tender
• jugoso = juicy
• hecho = cooked/done
• crudo = raw
• seco = dry

So El solomillo está muy tierno is a very natural way to comment on the quality or texture of the meat.

If you were talking about more than one piece, both the article/noun and the adjective would change, and the verb would also become plural:

• Los solomillos están muy tiernos.

Changes:

• el → los
• solomillo → solomillos
• está → están
• tierno → tiernos

This is a good example of how several parts of a Spanish sentence have to agree with each other.