Melt coconut oil, raw honey, and salt in a saucepan over medium heat. When it bubbles and foams, turn heat to low. Add rolled oats, chopped nuts, ground flaxseed, and cook on low for 2 minutes, stirring to coat. Pour granola into the mold; press in firmly. Cool at room temperature for an hour; remove and add toppings if desired. (We dipped them in melted dark chocolate and yogurt chips and then added coconut flakes and freeze-dried fruit pieces.) Store in an airtight container.