Pour the beans onto a sieve, rinse with cold water and drain. Clean, wash and slice the tomatoes. Clean, wash and slice spring onions. Dice the bacon, drain in a pan, add olive oil and deglaze with vinegar and 50 ml water.
Season bacon vinaigrette with salt, pepper and sugar. Dice bread. Heat the fat in a pan and roast the bread cubes in it while turning. Wash the chives, dab dry and cut into small rolls.
Mix the beans and spring onions. Line a plate with tomato slices, spread the beans and spring onions mixture on top. Pour the bacon vinaigrette over it. Serve sprinkled with chives and bread cubes.