1In a metal saucepan, combine milk, sugar, chocolate, and cornstarch over medium heat. Stir until the mixture comes to 240 degrees (on a candy thermometer). Immediately remove from heat, and leave the thermometer in.
2Take 3 tablespoons of butter and melt in microwave. Mix in the hash and stir, put back in microwave for 30 seconds, and stir again. Add the hash-butter mixture into your chocolate mixture, but do not stir!
3When the temperature of the fudge drops to 110 degrees, use a big spoon and stir vigorously for at least 7 minutes, or until it starts to get difficult to stir. Spread in a baking dish, 9×13 inches will work fine, and let the fudge cool down.
4To save on cleanup time, line the bottom of your baking dish with aluminum foil. If your fudge doesn’t turn out right, you probably weren’t using a thermometer or you were too impatient and did not let it cool down. Both are important to making good fudge. You could always use Cannabutter if you do not have hash.