Blanch the green beans in boiling water for about 3 to 4 minutes.
Run under cold water to stop the cooking or plunge into a bowl of ice water. Drain completely and pat dry with a paper towel and put in a casserole dish. Add red bell pepper strips.
Mix together the oil, mustard, garlic, salt and black pepper and pour over green beans and red bell peppers.
Marinate for at least 4 hours or overnight.
Preheat oven to 375.
Make a bundle of 8 or 9 beans and 2 or 3 strips of red bell pepper and wrap with half a bacon slice around each bundle. Secure with a tothpick and arrange in a single layer in the same casserole dish used for marinating.
Bake uncovered for 45 minutes or until the bacon is cooked.