Preheat oven to 325℉. Line two large baking sheets with parchment paper.
Place the 8 cups old fashioned (rolled) oats, 1 cup slivered almonds, 1 cup sliced almonds, and 1 cup unsweetened shredded coconut in a large bowl. Add the 1 teaspoon ground ginger, 1 teaspoon ground cardamom, and 1 teaspoon fine sea salt. Stir to combine. Add the 6 tablespoons olive oil and 8 tablespoons maple syrup and stir very well so that the oat mixture is coated with the oil and syrup.
Spread the granola evenly on the baking sheets and press it down tightly with the back of a spoon or spatula. Place in the oven and bake for about 22-23 minutes, depending on how well-cooked you like your granola. Remove from the oven and let the granola cool completely on the pans, about 30 minutes. It will crisp up a bit more as it sets.
Store the granola in an airtight container at room temperature.
Notes
Mix it well: When you add the olive oil and maple syrup, take your time folding and stirring the granola mix together. You want to get the mixture pretty well-coated with the oil and syrup so that there aren't any dry bits.
Watch the cooking time: Every oven is different, and while I have settled on 23 minutes as the ideal cooking time for this recipe, you may find that you need a bit more or less time. The goal is to get the granola nicely toasted but not too toasted and definitely not burned.
Cool it thoroughly: Granola needs to cool on the pans so that it crisps up completely. I let my granola cool on the baking sheets for at least 30 minutes and up to 1 hour before transferring it to an airtight container.
Go sweeter: As mentioned, I think this granola is just the right amount of sweet at 8 tablespoons of maple syrup. But, I know that some like a bit more! Feel free to add more maple syrup to suit your tastes.
Use sugar: If you need to use sugar, use light or dark brown sugar up to ½ cup for the maple syrup.
Make it saltier: I find that 1 teaspoon of sea salt is just right to suit my taste. However, I've made other recipes that call for more salt - you can add up to 1 ½ teaspoons of salt if you like.