Measure all the ingredients, except the raisins, in a large mixing bowl. Use a spatula and mix everything together well.
Spread the granola onto a baking sheet, flattening it so that it's 1/2-inch thick.
Bake the granola for about 25 to 30 minutes, stirring the granola occasionally, until browned and fragrant. It will be easy to stir the granola while it's hot, but it will harden as it cools.
Place the baking sheet on a wire rack and let cool completely. Break up the granola and stir in the raisins. Store the granola in an airtight container.
NOTES
- After adding the oil, use the same measuring cup to measure the honey - the honey will fall into the mixing bowl without any scrapping! - I used a non-stick baking sheet to bake my granola. If you don't have one and are worried about it sticking onto the baking sheet, line the baking sheet with baking parchment. - Adapted from Nigella Lawson