Bring the rice to the boil in 250 ml salted water, cover and cook over a low heat for about 20 minutes. In the meantime, rinse and drain the corn, kidney beans and white beans. Peel onion and cut into fine rings.
Wash, clean and slice the tomatoes. Wash the herbs and dab dry. Pluck parsley leaves from the stems and chop finely. Cut chives into fine rolls. Peel garlic and chop finely.
Mix vinegar, mustard, honey and garlic. Fold in olive oil. Season with salt and pepper. Stir in herbs. Drain rice if necessary. Mix the rice, corn, beans, tomatoes and onion rings with the vinaigrette.
Drain the sheep's cheese and crumble it. Arrange bean-corn salad on plates and sprinkle with feta cheese.