CAJUN SKILLET BEANS

1 medium onion chopped, 2 cloves garlic minced, 1T olive oil, 3 celery stalks chopped, 2 green or red peppers sliced, 1T fresh basil, black pepper and salt to taste, 1 pinch cayenne pepper, 2 cups chopped fresh or canned tomatoes, 1T dijon mustard, 4 cups red kidney beans cooked, 1 thinly sliced red onion for garnish. If it seems dry add a bit of water. -Saute onion, garlic, peppers and celery. -Add the rest of the ingredients and cook over low heat for about 20 minutes. -Garnish with thin red onion slices. -Serve with brown rice.