Preheat the oven to 275°F.
In a medium saucepan, combine sugar, honey, vanilla extract, cinnamon, allspice, salt, and water if using it.
Bring this mixture to a rolling boil over low heat, stirring as needed to prevent burning and until the brown sugar is mixed in. (Do not let this cool once it has started bubbling a little - the sugar will harden and be very hard to work with.)
While the mixture is coming to a boil, combine oats, pumpkin seeds, sesame seeds, flax seeds, pecans, and sunflower seeds in a large bowl. Toss to mix together.
Once the sugar mixture is bubbling, immediately pour this over the oat mixture and mix until it the oats are fully coated.
Spread the oats out onto a baking sheet with edges, then bake for 20 minutes at 275°F.
After 20 minutes, stir the granola and spread it back out on the sheet. Place back in the oven for 15 more minutes, watching carefully for the last 5 minutes to be sure that nothing burns.
Remove granola from the oven and let it cool (it will be soft at first so don't worry!)
Break up the granola into pieces and store it in an airtight container at room temperature.