Honeycomb-candy butter can be made 2 weeks ahead. Cover; chill
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#### Step 1
Line a baking sheet with a silicone baking mat or parchment paper. Bring sugar, maple syrup, and 2 Tbsp. water to a boil in a small saucepan fit with thermometer over medium-high heat, stirring until sugar dissolves. Continue to cook, swirling pan occasionally (do not stir), until thermometer registers 300°, 10–12 minutes. Remove pan from heat and stir baking soda into caramel (mixture will foam up immediately). Quickly and carefully pour mixture onto prepared baking sheet and spread with a heatproof rubber spatula. Let cool 30 minutes.
 
#### Step 2
Break honeycomb into 1" pieces; place in a resealable plastic bag and pound with a rolling pin until finely crushed. Mix honeycomb candy and salt into butter in a small bowl.