Bring a large pot of salted water to a boil. Peel cucumbers, halve lengthwise and scoop out seeds. Cut each half lengthwise into three pieces. Drop into boiling water, bring back to a boil and cook for 2 minutes. Drain.
Melt butter in a large skillet over medium-high heat. Add blanched cucumbers and stir or toss until just tender and warmed through, 2 to 3 minutes. (Do not overcook, as this makes cucumbers bitter.) Stir in mint, season with salt and pepper and serve immediately.
