Line the bottom of an 8 x 4″ pan with parchment paper and set it aside.
Combine the maple syrup, sugar, cream, salt, and whisky in a large pot. Stir over medium-heat until the sugar has dissolved, then stop stiring and let the sugar come to a boil.
Allow the sugar to boil down until it reaches 238 degrees fahrenheit or the “soft ball” stage on a candy thermometer (about 20 minutes). Once the sugar has reached temperature, remove the pot from the burner and stir in the butter.
Pour it into a heat-proof mixing bowl or the base of a stand mixer. Allow it to cool on the counter for 30-45 minutes (don’t bug the fudge while it’s cooling).
Once the fudge is cool, beat the batter on meduim-low until it’s thick and has a dull, light colour (about 5-7 minutes).
Microwave your walnuts for 20 seconds, then fold them into the fudge. Pour the fudge into your prepared pan, then cover the pan with plastic wrap and refrigerate for 1-2 hours (or until firm).
Remove the fudge from the pan and cut into 32 pieces. Enjoy!
Notes
Recommended low FODMAP serving – 3 pieces (you can have multiple pieces without exceeding your FODMAP load, but the heart and stroke foundation of Canada recommends limiting sugar intake to 48 g per day. So try to stick 3 squares).
Store in the fridge for up to 5 days or freeze for up to 2 weeks.