1 cup used ground coffee (the finer the better) - ask local coffee shops for a nice bulk that are often also finely ground
1 cup of broken down wax (~8 liquid oz of wax when melted in the oven)
1 cup molasses or syrup
The molasses acts as a binding agent with coffee grounds to keep the melting wax from just flowing all over. As molasses is mostly sugar, it will harden as the fire burns, allowing briquettes to burn longer. Instead of molasses, any syrup containing sugar works such as corn syrup.
If using sawdust, the finer the better, and it can be in place of coffee. As long as the ratio is 1 cup coffee/saw, 1 cup wax, 1 cup syrup, it should work.
- Preheat oven to 250F
- Place the coffee grounds in the oven to help dry it out more.
- Place the wax and molasses in an oven-safe pot or pan and place in the oven.
- Let the wax melt to liquid for about 20-30 minutes.
- Once the wax is liquid, mix it with the molasses and add coffee ground to it. Continue mixing until even.
- Distribute into silicone molds and let cool. Once at a lukewarm temperature, you can even put it in the fridge to help it solidify.