Halve the goat's cheese crosswise and place one slice on each slice of bread. Sprinkle with coloured pepper and bake in the oven under the grill for a short time. Wash cucumbers thoroughly and rub dry. Peel as desired. Halve lengthwise and remove seeds. Cut cucumber into pieces.
Pluck the mint leaves from the stalks. Mix oil, lemon juice and vinegar. Season with salt and pepper. Mix cucumber and mint leaves with the vinaigrette. Arrange slices of bread on top of the vinaigrette.