1. Place ham in the freezer until almost frozen, 3-4 hours. Cut into julienne strips. Set aside.
2. Fill a large pot with water, bring to boil. Add beans; cook until bright green, 2-3 minutes. Drain, rinse with cold water, set aside.
3. Place butter and oil in a large skillet over medium heat. When butter is melted, add onions and garlic; saute until onions are translucent - about 5 minutes. Add green beans, and turn heat to high; saute tossing until beans are heated through - about 2 minutes.
4. Add ham, vinegar, sugar, salt and pepper; saute until ham renders fat - about 3 minutes.
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