Heat the popcorn & oil in a stove top popper or heavy bottom pot with lid, over medium-high heat
When popcorn starts to pop, cover the pot and continue to cook until all the popcorn pops – shake the pot occasionally, you want to keep it moving, do not let it sit or it will burn
Pour popped corn into a large bowl, set aside
In a medium sauté pan over medium-high heat, melt margarine
Remove pan from heat
Add rosemary and mix well
Pour over popcorn
Season with salt & black pepper to taste
Toss and serve