In large heavy-bottomed skillet, cook bacon on medium until golden brown, stirring occasionally, about 15 minutes. With slotted spoon, transfer bacon to paper towels and reserve bacon fat from pan.
Heat oil in skillet on medium-high. Working in batches, add sprouts, flat side down, in single layer to skillet. Once sprouts are sizzling, add 1 tablespoon reserved bacon fat, a pinch of salt, and 1 tsp butter. Cook sprouts until flat sides are dark mahogany brown, about 3 minutes. Transfer sprouts to plate. Repeat with remaining sprouts.
When all sprouts are cooked, add bacon and 1 tablespoon butter to skillet. Return sprouts to skillet and toss until heated through. Add vinegar and simmer until reduced slightly, 1 to 2 minutes. Serve immediately.
Nutritional Information (per serving): About 210 calories, 15 g fat (6 g saturated), 10 g protein, 435 mg sodium, 10 g carbohydrate, 4 g fiber
St. Patrick’s Day, also known as St. Paddy’s Day is the national holiday of Ireland, which celebrates Saint Patrick the patron saint of Ireland, and is one of Christianity’s most widely known figures. St. Patrick’s Day is celebrated worldwide by Irish people and increasingly by people of all backgrounds. Celebrations worldwide include people dressing up, wearing of the color green, cities dyeing rivers green, shamrocks everywhere, drinking of alcohol, and large parades. See the History of St. Patrick’s Day for more on St. Patrick’s Day customs and celebrations.