How to Make It
In a small bowl, sprinkle the gelatin evenly over the cold water and let stand until softened, 5 minutes.
In a medium saucepan, bring the cream to a simmer over moderate heat. Meanwhile, in a small heatproof bowl, gently whisk the egg yolks. Slowly whisk in 1/2 cup of the hot cream, then scrape the yolk mixture into the remaining hot cream. Add the salt and cook over moderate heat, whisking constantly, until slightly thickened, 3 minutes; don’t let the custard boil. Remove from the heat and whisk in the dissolved gelatin, then whisk in the maple syrup and bourbon.
Pour the custard into eight 6-ounce ramekins or glasses and refrigerate overnight.
Preheat the oven to 275°. In a mini food processor, pulse the almonds until coarsely ground. Add the flour, sugar and salt and pulse a few times to blend. Add the melted butter and pulse to combine. Transfer the mixture to a rimmed baking sheet and crumble with your fingers to form clumps. Spread the clumps in an even layer and bake for about 12 minutes, until starting to dry out. Using 2 forks, toss the mixture once, then bake for 5 minutes longer, until lightly golden.
Increase the oven temperature to 350°. Break up the streusel into crumbs. Bake the crumbs for about 3 minutes longer, until golden brown and crisp. Stir in the orange zest and let cool completely.
Top the custards with the streusel and serve right away.