Мы купили хорошую решётку, потому что на ней удобно поджарить овощи.

Because хорошую agrees with решётку, which is the direct object of купили.

• решётка is feminine singular
• after купить in a normal affirmative sentence, the direct object goes into the accusative case
• the feminine accusative singular form of хорошая is хорошую

So:

• nominative: хорошая решётка
• accusative: хорошую решётку

Both the adjective and the noun change because they have to match in gender, number, and case.

For the same reason: решётку is in the accusative singular because it is the thing that was bought.

The verb купить / купили takes a direct object:

• Мы купили что? → решётку

Since решётка is a feminine noun ending in -а, its accusative singular usually changes:

• nominative: решётка
• accusative: решётку

This is a very common pattern for feminine nouns.

Here решётка most likely means a grill grate / rack / grilling grate rather than just any kind of grid or bars.

The noun решётка can mean several related things depending on context, for example:

• a grate
• a grid
• bars
• a rack
• a grill grate

Because the sentence talks about поджарить овощи на ней, the meaning is clearly something you can cook food on.

Because this sentence describes a location, not motion toward something.

With на:

• на + accusative often means onto something, with movement
• на + prepositional often means on something, at a location

Here the vegetables are being cooked on it, so Russian uses the prepositional case:

• она → на ней

Compare:

• Положи овощи на решётку. = Put the vegetables onto the grate.
• Овощи жарятся на решётке. = The vegetables are cooking on the grate.

So на ней means on it.

Because it refers back to решётка, and решётка is a feminine noun.

Russian pronouns must agree with the noun they replace. So:

• masculine noun → forms like на нём
• feminine noun → forms like на ней
• neuter noun → forms like на нём
• plural noun → forms like на них

Since решётка is feminine, the sentence uses на ней.

Here удобно means something like:

• it is convenient
• it is easy
• it works well
• it is practical

Russian often uses impersonal constructions like this:

• удобно + infinitive

So на ней удобно поджарить овощи literally means something like:

• On it, it is convenient to roast vegetables
• more natural English: It’s convenient to roast vegetables on it

There is no normal subject like it in Russian here. The sentence is built around a general idea: doing this is convenient.

This is about aspect.

• поджарить is perfective
• жарить is imperfective

With удобно + infinitive, Russian often chooses the aspect depending on what is being emphasized:

• perfective if you mean achieving a result, doing something successfully once
• imperfective if you mean the activity in general, the process, or repeated action

So удобно поджарить овощи suggests:

• it’s convenient to cook the vegetables and get them nicely browned
• the focus is on the completed cooking result

If you said удобно жарить овощи, that would sound more like:

• it’s convenient to grill vegetables in general
• the focus is more on the activity/process

Both can be possible in some contexts, but поджарить fits well if the speaker means the grill is good for getting vegetables cooked/browned.

Both relate to frying, roasting, or grilling, but they are not identical.

• жарить = to fry / roast / grill, usually imperfective
• поджарить = to fry / roast a bit, or to brown well; here it is perfective

Very roughly:

• жарить focuses on the process
• поджарить often suggests giving something a nice browned finish, or cooking it enough to get that result

In food contexts, поджарить can sound like:

• to brown
• to toast
• to grill until nicely cooked on the outside

So in this sentence, it gives a natural cooking nuance.

It is accusative here, but for inanimate plural nouns, the accusative often looks exactly the same as the nominative.

• nominative plural: овощи
• accusative plural: овощи

Since vegetables are inanimate, Russian uses the nominative-looking form for the accusative plural.

Compare with animate nouns, where accusative plural often matches genitive plural instead.

So:

• Я вижу овощи. = I see vegetables.
• Овощи лежат на столе. = Vegetables are lying on the table.

Same form, different case function.

Because потому что introduces a subordinate clause meaning because.

Russian normally puts a comma before subordinate clauses:

• Мы купили хорошую решётку, потому что на ней удобно поджарить овощи.

This is directly parallel to English punctuation in many cases, though Russian tends to use commas very consistently with subordinate clauses.

Yes, Russian word order is flexible, and several versions are possible.

This order is natural because it highlights the surface first:

• на ней = on it
• удобно = conveniently / it’s convenient
• поджарить овощи = to grill vegetables

So the sentence naturally sets up the idea:

• on this thing, it’s convenient to grill vegetables

Other orders are possible, for example:

• потому что удобно поджарить овощи на ней
• потому что овощи удобно поджарить на ней

But the original order sounds smooth and natural. Russian often moves elements around to control focus and emphasis, not because the basic grammar changes.

Because Russian past tense agrees with the subject in gender and number.

Since мы means we, the verb must be plural in the past tense:

• я купил / купила
• ты купил / купила
• он купил
• она купила
• мы купили
• они купили

So мы купили simply means we bought.

The correct spelling is решётка, with ё.

In many printed texts, especially informal ones, Russian often writes ё as е, so you may also see:

• решетка

But the pronunciation and dictionary form are решётка.

For learners, it is useful to remember that ё is a separate letter and usually represents the sound yo. When native texts omit the dots, you have to know the word already or figure it out from context.