Boil the rye in plenty of unsalted water the night before and let it soak overnight. The next day, pour off the soaking water and cook the rye in fresh water for approx. 10-15 minutes until soft. Drain and let cool.
For the vinaigrette, mix all ingredients except for the shallots in a shaker. Cut the shallots into fine strips and stir in, then let everything go through.
Mix the rye with the vinaigrette well, dice 1 - 2 peppers and the tomatoes, coarsely chop the rocket and fold everything into the rye. Let it steep and season with vinegar, salt and maple syrup before serving.