Cook the lentils with bay leaf for about 30-35 minutes according to the package instructions. Fry bacon in portions in a pan until crispy, drain on kitchen paper. Cut cheese into cubes.
Wash and quarter the pear, remove the core and cut the quarters lengthwise into slices. Wash the chives, dab dry and cut half into small rolls. Mix vinegar, salt, pepper, 1-2 tablespoons of water.
Add oil. Drain the lentils and mix with the salad dressing. Arrange lentils with pear wedges, radish sprouts and the cheese on plates. Sprinkle with chive rolls and garnish with the remaining chives.