Prep your setup. Preheat the oven to 350°F (175°C). Line a muffin tin with foil or parchment and gently nestle one cone in each cup to help them stand. If you don’t have a muffin tin, use a 9x13 pan lined with crumpled foil to create small nests.
Whisk dry ingredients. In a medium bowl, whisk flour, baking powder, and salt. Set aside.
Beat the butter and sugar. In a large bowl, beat softened butter and granulated sugar with a hand mixer or stand mixer on medium speed until pale and fluffy, 2–3 minutes.
Add eggs and flavor. Beat in eggs one at a time. Add vanilla, lemon zest, and 1 tablespoon lemon juice. Mix until smooth.
Combine the batter. Add half the dry mixture, then milk, then the remaining dry mixture. Mix on low just until combined. Do not overmix.
Make it pink. Stir in 1–2 drops of pink or a tiny dot of red gel food coloring until you reach a soft pink hue. A little goes a long way.
Fill the cones. Spoon batter into the cones, filling each about 2/3 full. Leave room for rise to avoid overflow.
Bake. Bake 16–20 minutes, until a toothpick inserted into the center comes out clean and the tops spring back lightly. Rotate the pan halfway for even baking.
Cool fully. Let cones cool in the pan 5 minutes, then transfer to a rack. Cool completely before frosting to prevent melting.
Make the frosting. Beat 1/2 cup softened butter until creamy, 1–2 minutes. Add 3 cups powdered sugar, 1 tablespoon lemon juice, 1–2 tablespoons milk or cream, and a pinch of salt. Beat until fluffy, 2–3 minutes. Adjust with more milk for a softer consistency or more sugar for thickness.
Color the frosting. Add a drop of pink gel food coloring and beat until evenly tinted. Taste and adjust lemon to your liking.
Frost and decorate. Transfer frosting to a piping bag fitted with a star tip, or use a zip-top bag with the corner snipped. Pipe tall swirls to mimic soft-serve. Finish with sprinkles, sanding sugar, or a touch of lemon zest.
Serve. Stand cones upright in the muffin tin or a cone holder for easy serving. Enjoy immediately for the best crunch and texture.