In a medium saucepan, melt the butter and add the brown sugar. Stir until the sugar is melted and begins to caramelize.
Pour in the milk and heavy cream, then add the salt and vanilla extract. Heat gently over low heat, but do not boil.
Meanwhile, in a separate bowl, whisk the egg yolks. While whisking constantly, slowly add a ladleful of the warm butterscotch mixture to temper the eggs.
Pour the egg mixture back into the saucepan, then cook over low heat, stirring constantly, until the custard thickens and coats the back of a spoon. This will take about 5-7 minutes.
Strain the mixture through a fine-mesh sieve, then let it cool to room temperature before refrigerating for at least 4 hours (or overnight).
Pour the chilled custard into an ice cream maker and churn according to the manufacturer's instructions.
Spoon the ice cream into the waffle cones, then place them on a tray and put them in the freezer for 30 minutes to firm up.
Melt the chocolate coating, then dip the top of the ice cream into the melted chocolate and immediately sprinkle with toasted almond pieces for a crunchy texture.
Return the cones to the freezer for another 30 minutes to allow the chocolate coating to set.
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