1. Rinse sprouts and trem stems.
2. Remove loose outer leaves.
3. Cut a small x in bottom of each.
4. Bring large pot of water to a boil. Add sprouts and boil gently, uncovered, just until a fork can be inserted in base without a lot of resistance.
5. Immediately drain and rinse with very cold water to stop cooking.
6. When chilled, drain well. If making ahead, store in fridge in a sealed plastic bag for up to 2 days.
7. When ready to serve, peel onions, slice in half, then thinly slice.
8. Melt butter in large deep fry pan. Add onions, seasonings and salt.
9. Stir often over medium heat, from 5 - 8 mins., to sweeten onions.
10. Add sprouts, Cover and stir often until hot which takes about 8 minutes.