jagaimo o yudete kara nabe ni ireru to, sugu taberareru.

を marks the direct object of the verb. Here, じゃがいもをゆでて means boil the potatoes.

So:

• じゃがいも = potatoes
• を = marks what is being acted on
• ゆでて = boil / boil and...

In other words, the potatoes are the thing being boiled.

ゆでて is the て-form of ゆでる (to boil).

The て-form has many uses, and here it connects actions in sequence. In this sentence, it combines with から to make ゆでてから, which means:

• after boiling
• boil ... and then ...

So じゃがいもをゆでてから means after boiling the potatoes.

〜てから means after doing ~.

It shows that one action happens first, and the next action happens only after that.

So:

• ゆでてから = after boiling
• 食べてから出かける = go out after eating

In your sentence, it tells you the order:

1. boil the potatoes
2. put them in the pot
3. then they are ready to eat

Because 入れる (to put in) takes two kinds of information:

• the thing being put somewhere
• the destination/location it goes into

In 鍋に入れる:

• 鍋 = pot
• に = marks the destination
• 入れる = put in

So 鍋に入れる means put into the pot.

If you used 鍋を, that would not fit this verb in this meaning.

Here, と is a conditional or result marker. It often means:

• when
• if
• whenever

It can also suggest a natural result.

So 鍋に入れると、すぐ食べられる means something like:

• when/if you put them in the pot, they can be eaten right away
• once you put them in the pot, they’re ready to eat immediately

This と is often used when one action leads naturally to a result.

Because 入れると uses the plain form before と.

With this grammar, the verb before と is normally in plain form:

• 押すと、開く = If/when you press it, it opens
• 春になると、暖かくなる = When spring comes, it gets warm

So here:

• 入れると = if/when you put (it) in

It is not a request form or command form. It is just the normal form used before と.

Here it means can eat or more naturally is edible / is ready to eat.

食べられる can be:

• the potential form of 食べる = can eat
• sometimes a passive form in other contexts

But in this sentence, the natural meaning is the potential one:

• すぐ食べられる = can be eaten right away / is ready to eat immediately

It is not saying that someone eats it automatically. It means it is in a state where eating is possible.

すぐ means right away, immediately, or soon.

It modifies 食べられる, so すぐ食べられる means:

• can be eaten right away
• is ready to eat immediately

Word order like this is very common in Japanese: adverbs often come before the verb they modify.

Japanese often leaves out subjects and objects when they are understood from context.

In a recipe or cooking instruction, the omitted subject is often something like:

• you
• one
• or just an implied instruction

Also, the object of 入れる is omitted because it is obvious: it is the potatoes.

So the full sense is something like:

• After boiling the potatoes, if/when you put them into the pot, they can be eaten right away.

Japanese avoids repeating things that are already clear.

Yes, very much so.

Recipe-style Japanese often uses:

• plain verb forms
• omitted subjects
• action chains like 〜てから
• result expressions like 〜と

This gives a concise instruction style.

So instead of spelling everything out, Japanese often says something compact like this and expects the reader to understand the missing details from the cooking context.

You can break it down like this:

• じゃがいもを = potatoes + object marker
• ゆでてから = after boiling
• 鍋に = into the pot
• 入れると = if/when you put them in
• すぐ = immediately
• 食べられる = can be eaten / are ready to eat

So the structure is:

[After doing action A], [if/when you do action B], result C happens.

More specifically:

After boiling the potatoes, when you put them in the pot, they’re ready to eat right away.

Not really. Even though English might sometimes translate it smoothly in a way that sounds like and then, the grammar is not the normal Japanese and.

Here と is showing a condition or automatic result:

• do X, and then Y happens
• when you do X, Y happens
• if you do X, Y happens

So it is better to understand と here as when/if, not simply and.

Yes.

• すぐ食べられる = can be eaten right away / immediately
• もう食べられる = can already be eaten now

So:

• すぐ focuses on speed or immediacy
• もう focuses on the fact that it has reached the ready state already

In your sentence, すぐ emphasizes that once that step is done, it is ready without delay.