In a large bowl, combine oats, nuts, flaxseed and sugar and mix well. In a small saucepan over medium low heat, combine butter, bourbon, honey and vanilla bean paste. Whisk the mixture until the butter has melted and cook for a minute or two until bubbling so some of the alcohol can cook out. Remove from heat and pour the wet ingredients into the dry oats. Stir well until all of the granola is moistened (no there is not a better word to use). Spread the granola on the baking sheet in an even layer. Bake for 10 minutes, then flip. Bake for 10 minutes more, flipping again. Continue to bake for 15 more minutes, tossing the granola every 5 minutes. Remove from the oven, sprinkle with the sea salt and let cool COMPLETELY. I find that granola clumps together best when it’s still wet and air drys until cool. Once cool, break into clumps and pieces with your hands.