In a skillet on the stovetop, melt the coconut oil. Add the maple syrup and then the walnuts. Cook over low to medium heat for approximately 5 minutes, watching them lightly brown. Turn them every few minutes to ensure they do not burn and carefully monitor the reduction of the maple syrup. (Walnuts will continue to brown when removed from the stove, so be sure to take them off the stove before they become too dark.) Once they are ready, remove the walnuts and place them on parchment paper to cool. During this time, the maple syrup will harden. After they have cooled, fold them inside the parchment paper and use a rolling pin to crumble them into small pieces. Set them aside.