Line 2 large baking sheets with parchment paper. Place the popped popcorn in 1 or 2 large bowls.
In a saucepan, combine the sugar, milk, corn syrup, and salt. Cook over medium-high heat, stirring constantly, until the sugar is completely dissolved.
Continue cooking until the mixture reaches 230°F on a candy thermometer. Remove from the heat and stir in the vanilla extract and enough pink food coloring to reach the desired color.
Pour the sugar mixture over the popcorn and gently stir until the popcorn is evenly coated.
Spread the coated popcorn in an even layer on the prepared baking sheets.
Let the popcorn sit at room temperature until completely dry and set.