Preheat oven to 350F.
Spread the nuts on a baking sheet and toast in the oven for 5 minutes. Stir and bake 8 to 10 minutes more or until light golden brown. Remove from the oven.
Meanwhile, in a glass measuring cup combine butter, oil and brown sugar. Microwave on high for 30 seconds. Stir to dissolve, then mix in the cayenne, rosemary and salt.
Pour the seasoned butter over the warm nuts on the baking sheet and toss well to coat. Return to oven for 2 or 3 minutes until toasted but not overcooked and mix again. Spread out on paper towels to cool. Store tightly covered.
Recipe by Lowcountry Cuisine Magazine at https://lowcountrycuisinemag.com/recipes/appetizers-snacks/spicy-sweet-pecans/