Add the oil and walnuts to a small skillet and heat over medium-high.
Add the remaining ingredients and stir to coat the walnuts.
Stirring consistently, cook until rosemary is very fragrant and walnuts have some color, about 3 to 5 minutes. Careful not to walk away from the nuts because they burn easily!
Lay the nuts on a parchment-lined baking sheet to dry, leaving space between them so that they don’t stick together.
Enjoy in your study with brandy and books...or in the backwoods