Si la salsa está demasiado picante, pondré un poco de yogur.

Because si without an accent means if.

Sí with an accent usually means yes, or it can be part of expressions like en sí. So in this sentence, Si la salsa está demasiado picante... means If the sauce is too spicy...

Spanish uses estar for a temporary state or condition, and ser for more permanent or defining characteristics.

Here, the sauce being spicy is treated as its current condition or how it tastes right now, so está is the natural choice:

• La salsa está demasiado picante = the sauce is too spicy right now

If you said es picante, that would sound more like it is spicy by nature / it’s a spicy sauce.

In Spanish, after si for a real, possible condition, you normally use the present indicative, not the future.

So the standard pattern is:

• Si + present, future

In this sentence:

• Si la salsa está demasiado picante, pondré un poco de yogur.

That is exactly like English:

• If the sauce is too spicy, I’ll add a little yogurt.

Spanish does not say Si la salsa estará... here.

After si meaning if, Spanish normally does not use the subjunctive for real or likely conditions like this one.

So you say:

• Si la salsa está demasiado picante...

not

• Si la salsa esté demasiado picante...

This is one of the most important patterns to learn:

• si + present indicative for real possible situations
• si + imperfect subjunctive for unlikely or hypothetical situations

For example:

• Si la salsa estuviera demasiado picante, pondría yogur.
  = If the sauce were too spicy, I would add yogurt.

It means too spicy, not just very spicy.

That difference is important:

• muy picante = very spicy
• demasiado picante = too spicy / excessively spicy

So demasiado often means that something has gone beyond a comfortable or acceptable level.

Not in the singular. Picante is an adjective that has the same form for masculine and feminine singular:

• el curry picante
• la salsa picante

In the plural, it becomes:

• picantes

So:

• la salsa está picante
• las salsas están picantes

Because the sentence is talking about a specific sauce, not sauce in general.

• la salsa = the sauce

In context, both speaker and listener know which sauce is being discussed, so the definite article is natural.

If you were speaking more generally, you might say something like:

• La salsa puede estar muy picante. = Sauce can be very spicy.

But in this sentence, la salsa refers to a particular sauce on the table or in the dish.

Pondré is the future tense of poner.

The verb poner is irregular in the future. Instead of using the full infinitive stem, it changes to pondr-:

• poner → pondré

Full future forms:

• pondré
• pondrás
• pondrá
• pondremos
• pondréis
• pondrán

So pondré means I will put / I will add.

In cooking, poner is a very natural everyday verb for adding an ingredient.

Yes. Both are correct.

• pondré = I will add
• voy a poner = I’m going to add

In everyday spoken Spanish, ir a + infinitive is very common. So these are both natural:

• Si la salsa está demasiado picante, pondré un poco de yogur.
• Si la salsa está demasiado picante, voy a poner un poco de yogur.

The future tense can sound a little more neutral or formal; voy a poner can sound a bit more immediate or conversational.

Because un poco de means a little of / some and it must be followed by de before the noun.

So:

• un poco de yogur = a little yogurt
• un poco de agua = a little water
• un poco de azúcar = a little sugar

You cannot normally say un poco yogur.

This structure is very common in Spanish:

• mucho de is usually not used this way, but
• un poco de, algo de, nada de, una taza de, etc. are very common.

Because here yogur is being used in a general, uncountable sense: some yogurt.

So Spanish says:

• un poco de yogur

You would use del only if you meant some of the specific yogurt already mentioned or identified:

• Pon un poco del yogur griego que compramos ayer.
  = Add a little of the Greek yogurt we bought yesterday.

So:

• de yogur = some yogurt, generally
• del yogur = some of the yogurt, specifically

It is normally masculine in standard Spanish:

• el yogur
• un yogur

But in this sentence, after un poco de, you do not use the article, so you get:

• un poco de yogur

In Spain, yogur is the standard everyday spelling.

Pondré is stressed on the last syllable: pon-DRÉ.

The written accent mark shows that final stress. Without the accent, Spanish pronunciation rules would suggest a different stress pattern.

So the accent is important both for pronunciation and spelling.

A rough pronunciation is:

• pon-DRÉ

And similarly:

• está = es-TÁ

Those accent marks help show where the stress goes.

Yes. In cooking, Spanish often uses several verbs that can all work depending on style and nuance:

• poner = put/add
• echar = add/throw in
• añadir = add

So you could also hear:

• Si la salsa está demasiado picante, echaré un poco de yogur.
• Si la salsa está demasiado picante, añadiré un poco de yogur.

The original sentence with poner is perfectly natural and very common in everyday speech.