hikkurikaesi te mo, ryoumen ga yakiagatta to ha kagiranai.

Normally, it would be written without spaces:

ひっくり返しても、両面が焼き上がったとは限らない。

A natural reading is:

ひっくりかえしても、りょうめんがやきあがったとはかぎらない。

The spaces in your version are just there to make the parts easier to see.

It comes from the verb ひっくり返す, which means to turn over / flip over / overturn.

Breakdown:

• ひっくり返す = dictionary form
• ひっくり返して = て-form
• ひっくり返しても = even if (you) flip it over / even after flipping it over

So the ても part is important: it gives a concessive meaning, like even if or even though.

Here, 〜ても means something like:

• even if ...
• even after ...
• just because ... doesn't mean ...

So ひっくり返しても suggests that flipping it over is not enough to guarantee the result in the second half of the sentence.

In smoother English, this often comes out as:

• Even if you flip it over...
• Even after turning it over...
• Just because you turned it over...

Which English version sounds best depends on the context.

Japanese often leaves out things that are obvious from context.

So here, the thing being flipped—maybe a pancake, a piece of meat, bread, or something else—is omitted because the listener is expected to already know what it is.

In English, we usually need it:

• Even if you flip it over...

In Japanese, leaving that object unsaid is completely normal.

両面 means both sides or the two sides.

• 両 = both
• 面 = side / surface / face

So 両面が焼き上がった means both sides have cooked through / both sides are done.

が marks 両面 as the subject of 焼き上がった.

In other words, both sides are the thing that has—or has not—reached the cooked/finished state.

So the structure is roughly:

• 両面が焼き上がった = both sides have finished cooking

Using が here is very natural because it marks the content of the statement that is later followed by とは限らない.

焼き上がった is the past/plain form of 焼き上がる.

焼き上がる means something like:

• to finish baking
• to be fully grilled
• to be cooked through and completed

It emphasizes the idea of a finished result.

A useful comparison:

• 焼いた = cooked/grilled something
  
  • transitive: someone did the cooking
• 焼けた = got cooked / was baked / was done
• 焼き上がった = finished cooking completely / came out fully done

So 焼き上がった sounds a bit more like has properly finished cooking, which fits this sentence well.

Because the sentence is talking about whether the state has been achieved.

The idea is not just both sides cook, but rather both sides have ended up fully cooked.

Japanese often uses the plain past form in this kind of statement when talking about whether a completed result can be said to have happened.

So here:

• 両面が焼き上がった = both sides have finished cooking / are fully done

Even though the overall sentence is a general observation, the inner clause describes a completed result.

This と is part of the grammar pattern 〜とは限らない.

You can think of it as marking the preceding clause as a proposition or statement:

• 両面が焼き上がった = both sides are fully cooked
• 両面が焼き上がったとは限らない = it is not necessarily the case that both sides are fully cooked

So the と is not a separate and or anything like that. It belongs to the set phrase.

〜とは限らない means:

• it is not necessarily the case that ...
• it is not always true that ...
• you cannot assume that ...
• ... is not guaranteed

This is a very common pattern in Japanese.

So:

• 両面が焼き上がったとは限らない = it is not necessarily true that both sides are fully cooked

It does not mean the speaker is definitely saying both sides are not cooked. It only means that this result is not guaranteed.

In this pattern, は adds a contrastive/emphatic nuance.

It helps give the sense of:

• as for saying that ...
• you cannot necessarily say that ...
• it does not follow that ...

But in practice, it is best to learn とは限らない as one grammar pattern rather than trying to interpret the と and は separately every time.

Not exactly.

It means you cannot conclude that both sides are cooked just from the fact that it was flipped over.

So the nuance is:

• flipping it over does not guarantee even cooking

It leaves open several possibilities:

• maybe both sides are cooked
• maybe only one side is cooked enough
• maybe neither side is fully done

The sentence is about lack of certainty, not a firm negative conclusion.

Yes, that is a very natural translation.

Other good translations include:

• Even if you flip it over, both sides won’t necessarily be fully cooked.
• Just because you flip it over doesn’t mean both sides are done.
• Turning it over does not necessarily mean both sides have cooked through.

All of these capture the same basic grammar and nuance.

No. It is natural here, but other verbs could appear depending on nuance.

For example:

• ひっくり返す = flip over, turn over, often a bit vivid or physical
• 裏返す = turn something over to the other side
• 返す = turn over / flip, in some contexts

ひっくり返す can sound a bit more forceful or physical than a plain turn over, but in many everyday contexts it is perfectly normal.

It could, depending on nuance, but 両面が is perfectly natural here.

• 両面が焼き上がった focuses on both sides as the subject reaching the cooked state.
• 両面とも焼き上がった would put a little more emphasis on both of them alike.

Both are possible in Japanese, but 両面が焼き上がったとは限らない is a very normal way to express the idea in this sentence.