Grate zucchini (larger bits gives a more satisfying texture when finished). Dice onion (s). Over medium heat (gas 2) melt butter in frying pan. Add the onion to pan and sauté for 2-3 minutes. Add shredded zucchini and mix well with the onions. Toss in your salt/pepper/other spices. Sauté mixture until zucchini is slightly limp (3-4 minutes). Lastly, put in the sour cream and mix it in well. Reduce the heat and cook either for 1 minute or until the sour cream is warm. Serve immediately!