N1
と来たら
ときたら
For …(is the best), When it comes to, Concerning
夏ときたらやっぱりキンキンに冷えたビールですよ!
When it comes to summer, as expected, a cold beer is the best!
Explanation
「と来たら」 has 3 uses
1When it comes to X
Naming a season or thing, then the one thing that goes best with it: 夏と来たらビールだ.
夏ときたらやっぱりキンキンに冷えたビールですよ!
When it comes to summer, as expected, a cold beer is the best!
寒い日ときたら、鍋でしょう。
For a cold day, hot pots (is the best), don't you think?
2Don't get me started on
Naming someone or something close to you, then grumbling about it: うちの夫と来たら、寝てばかりいる.
うちの息子ときたら、休みの日は昼まで寝ている。
That son of mine sleeps till noon on his days off.
最近の電車ときたら、毎朝のように遅れる。
Trains these days are late almost every morning.
3If it's that bad
An extreme situation comes first, then the result that naturally follows, often with 当然だ, わけがない or はずがない.
「田中さんがクビになったと聞いたよ。」「毎日遅刻ときたらクビになるのは当然でしょ。」
'I heard Mr. Tanaka got fired.' 'No wonder he would get fired when he was late every day.'
パワハラときたら大問題になるのは当然でしょう。
When it comes to power harassment, of course it is going to become a huge problem.