Mom's recipe from Watash Co. Extension
Does the sheer sugar load require something sharp to cut through it? High-sugar confections coat the palate completely, meaning bitter and acidic elements work best alongside them. Strong black coffee or unsweetened iced tea provides the necessary contrast to balance the heavy fat content of the peanuts. Sharp aged cheddar cheese also makes a traditional, effective pairing, as the salt and dairy proteins mute cloying sweetness.
Sugar crystals form unwanted grains instantly if disturbed while climbing toward 240 degrees Fahrenheit. Stirring too early ruins batches by introducing seed crystals that propagate throughout the syrup. Washing down the sides of the kettle with a wet pastry brush removes stray sugar grains before they can ruin the thermal ascent. Raw Spanish peanuts enter the pot at 240 degrees, requiring continuous motion afterward to prevent scorching against the bottom of the pan.
Reaching 320 degrees Fahrenheit marks the hard-crack stage necessary for a crisp, non-chewy snap. Adding butter, soda, salt, and vanilla off the heat causes vigorous foaming that aerates the mixture. Spreading the hot mass as thinly as possible on a greased platter ensures the brittle cools rapidly before crystallization dulls the shine.