Old-Fashioned Buttermilk Fudge

Gather the ingredients.

Prepare an 8 x 8-inch pan by lining it with aluminum foil and spraying the foil with nonstick cooking spray.

Place the buttermilk, butter, corn syrup, sugar, salt, and baking soda in a large pan over medium-high heat. This candy bubbles up a lot, so be sure to use a pan that will hold at least quadruple the volume of ingredients.

Stir until the sugar and butter dissolve, then insert a candy thermometer.

Continue to cook the candy, stirring occasionally, until the thermometer reads 240 F/115 C, also known as soft-ball stage .

Once at 240 F, remove the pan from the heat and pour the vanilla extract on top, but do not stir.

Allow the candy to cool for 10 to 15 minutes, until it reaches approximately 150 F on the candy thermometer.

Remove the thermometer from the candy and add the chopped, toasted nuts.

Use a wooden spoon to stir the fudge until it thickens. This is called "beating" and it gives the fudge the right texture and body. As you stir it, the fudge will go from a thin, shiny, translucent mixture to a candy that is opaque, thicker, and matte in color. It will become more difficult to stir, and your spoon will start leaving tracks.

Once the fudge is thick and opaque, scrape it into the prepared pan and quickly smooth it into an even layer. If you wait too long during these steps, it may start to stiffen and become hard to work with. If this happens, quickly stir in a spoonful of very hot water, and mix until the fudge loosens up, then scrape it into the pan.

Allow the fudge to set at room temperature for about 2 hours.

Once set, remove it from the pan using the foil as handles, and cut it into small squares to serve.

Enjoy.