Bayern needed just five minutes to recover from the equalizer as they combined their way through Frankfurt's territory before Joshua Kimmich's square pass found Lewandowski, who poked home at the far post from a tight angle. The goal was at first ruled offside but later confirmed by the video assistant referee.

Frankfurt threw every man up front but Bayern stood firm and sealed their 24th appearance in the German Cup final.

Bayern face Bayer Leverkusen in the final in Berlin's Olympia stadium on July 5.

"We did not play well in the second half. The first half was good but we should have scored more goals. Ultimately, I am happy that we reached the final," said Bayern head coach Hanis Flick.

"Bayern were clearly the better team in the first half. We improved our performance in the second and restored parity deservedly," Frankfurt head coach Adi Hutter said.

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