La remolacha con un poco de vinagreta queda muy bien, y los espárragos también.

In Spanish, food items are very often talked about with the definite article when speaking generally.

So:

• La remolacha = beetroot / beets, as a food in general
• Los espárragos = asparagus, in general

English often drops the article in this kind of sentence, but Spanish usually keeps it.

So La remolacha con un poco de vinagreta... sounds natural, whereas English would normally just say Beetroot with a little vinaigrette...

Here quedar does not mean to stay or to remain. In this context, it means something like:

• to work well
• to go well
• to turn out well
• to suit

So La remolacha con un poco de vinagreta queda muy bien means that beetroot goes very well with a little vinaigrette.

This use of quedar bien is very common in Spanish for combinations, appearance, style, and results:

• Ese color te queda muy bien. = That color suits you very well.
• El queso con membrillo queda muy bien. = Cheese goes very well with quince paste.

Because the subject of the first clause is la remolacha, which is singular.

• La remolacha ... queda muy bien.

Even though con un poco de vinagreta is present, that part is just a prepositional phrase; it does not change the number of the verb.

So the structure is:

• subject: La remolacha
• verb: queda
• extra information: con un poco de vinagreta

If the subject were plural, then you would use quedan:

• Las remolachas con un poco de vinagreta quedan muy bien.

This is a very natural case of ellipsis: Spanish leaves out words that are understood from the previous clause.

The full version would be:

• La remolacha con un poco de vinagreta queda muy bien, y los espárragos también quedan muy bien.

But repeating quedan muy bien is unnecessary, so Spanish omits it.

This is just like English:

• Beetroot goes very well with a little vinaigrette, and asparagus does too.

So también here means too / as well, and the missing idea is go very well with it too.

Both are possible, but un poco de adds the idea of a little or a small amount of.

So:

• con vinagreta = with vinaigrette
• con un poco de vinagreta = with a little vinaigrette

Using un poco de can make the sentence sound more specific, more natural in a food context, and sometimes slightly more appealing or balanced.

Yes, vinagreta is the usual Spanish word for vinaigrette.

It refers to a dressing typically made with oil and vinegar, often with other ingredients added.

A learner might also notice that the words are clearly related etymologically, so they are easy to remember.

Yes, absolutely. In fact, that order may feel more straightforward to many learners because it keeps the verb closer to the subject:

• La remolacha queda muy bien con un poco de vinagreta.

Both versions are natural:

• La remolacha con un poco de vinagreta queda muy bien.
• La remolacha queda muy bien con un poco de vinagreta.

The original version puts a little more focus on the combination beetroot with a little vinaigrette as a unit.

Putting también at the end is very natural here because it attaches to the whole omitted idea:

• y los espárragos también = and asparagus too

Spanish often places también where it sounds most natural in the sentence, and in short elliptical structures like this, sentence-final position is common.

You could expand it as:

• y los espárragos también quedan muy bien

So también is effectively adding los espárragos to the same comment already made about la remolacha.

Spanish normally uses espárragos in the plural when referring to asparagus spears as food.

So:

• los espárragos = asparagus

English often treats asparagus as a mass noun, but Spanish commonly uses the plural form.

This is one of those places where Spanish and English organize food vocabulary differently.

Here muy bien means the combination is very good, works very well, or goes together very well.

It does not literally mean that the beetroot is behaving well. Instead, it describes the quality of the pairing.

So:

• queda bien = goes well / works well
• queda muy bien = goes very well / works really well

This phrase is extremely common in Spanish when talking about:

• food combinations
• clothing and colours
• decoration
• arrangement and presentation

You could, but the meaning would shift.

• La remolacha con un poco de vinagreta está muy bien
  This sounds like the beetroot with a little vinaigrette is very good / is nice / is fine. It can work, especially when commenting on a dish you have in front of you.

• La remolacha con un poco de vinagreta es muy buena
  This sounds more like it is very good in quality, but it is less idiomatic if your main idea is that the ingredients go well together.

• queda muy bien
  This is the most natural choice if you want to express that the combination works especially well.

So quedar muy bien is especially good for talking about how things match or pair.

Con means with, and it introduces the ingredient or accompaniment that makes the combination work.

So:

• La remolacha con un poco de vinagreta = beetroot with a little vinaigrette

In this sentence, con un poco de vinagreta tells you what the beetroot is being paired with. It is part of the idea being evaluated by queda muy bien.

Yes: the written accent in espárragos shows that the stress falls on spá:

• es-PÁ-rra-gos

Without the accent mark, Spanish stress rules would suggest a different stress pattern, so the accent is necessary.

Also, in Spain Spanish:

• g before o is a normal hard g sound, as in go
• the rr is a rolled or strongly tapped r

So the word is pronounced roughly like es-PA-rra-gos, with the stress clearly on the second syllable.