Place the butter in a saucepan over high heat. Using Swerve: Before you begin, make sure you have everything ready to go - the almond milk and the butter next to the pan, ready to put in. Work fast or the sweetener will burn. Heat butter on high heat in a heavy-bottomed 2-quart (2 L) or 3-quart (3 L) saucepan. As soon as it comes to a boil, watch for specks of brown (this is brown butter....so good on veggies!). Immediately add the Swerve and the almond milk to the pan. Whisk until sauce is smooth. Add the extract and salt. Let cool in the pan for a couple minutes, and then pour into a glass mason jar and let sit to cool to room temperature. Store in the refrigerator up to 2 weeks.