Brussels sprouts with pancetta

Trim 600g brussels sprouts,then trim and slice 1 bunch spring onions.Add sprouts to a pan of boiling water and simmer for 4 mins.Drain.Heat 1tbsp oil in a pan and stir-fry a 150g diced pancetta until fat starts to crisp.Add another 1tbsp oil,spring onions and sprouts and stir-fry for 4 mins.Remove from heat,add 25g butter and toss everything together.serve