Line an 8×8-inch pan with parchment paper

Melt white chocolate, condensed milk, and butter over very low heat, stirring constantly until smooth

Remove from heat and stir in lemon zest, lemon juice, lemon extract, and salt

Add pink food coloring gradually until desired shade is reached

Pour into prepared pan, smooth the top, and add toppings if using

Refrigerate until fully set, then lift out and slice into squares