Peanut Butter for a Good Cause?

Tim and I are city dwellers and as a result we are constantly seeing people who are poor and hungry. It is impossible to ignore, and it is wrong to turn a blind eye to these people. I always feel helpless when I am sitting at a stop light and a man is walking from car to car begging for change. I never have any readily available money in my car, and honestly, I don't feel like my giving him a spare 15 cents is going to do him a whole lot of good. But, I do have a deep desire to do something that will help them, if even temporarily. Since I have a job that requires me to be driving for a good part of the work day, I think that I see this type of thing more regularly than a lot of other people do. What I have decided to do is pack a few peanut butter sandwiches in my car every day. This way, I have something handy to grab and hand to the person on the other side of my car door. I hope that these sandwiches will be a blessing to these people, and that they will satisfy their hunger for a time. I will use whole wheat bread so that the sandwiches will be a good source of protein and fiber. I am wondering how others of you have responded to these types of situations, and if you have any other ideas on how I should respond. I hope you will tell me if you have had any creative ideas in helping others in need. I hope to make this a long term commitment. I know it is small, but at least it is something.