A bourbon sour sweetened with maple syrup and served on the rocks, the St. Lawrence also works well served straight-up. Indeed, we first came across it...
I got distracted while making this and doubled the maple syrup by accident. I cut the simple to compensate; it was still VERY sweet, but drinkable and pleasant.
The mistake here is the Ango. I'm not a fan of Fee Bros bitters, but they're serviceable when necessary. Their Black Walnut bitters was a clearly needed sub for the Ango.