Prepare the Crust: Use a store-bought, homemade, or no-bake crust. Set aside.
Make the Lemon Curd: In a saucepan, whisk cornflour and sugar. Stir in lemon juice and coconut milk until smooth. Slowly add yellow food coloring for a bright color.
Cook the Curd: Heat over medium, stirring until sugar dissolves (1-2 minutes). Increase to medium-high and cook until thick and bubbling (about 5 minutes).
Chill the Filling: Pour the lemon curd into the crust and refrigerate for 2 hours until firm.
Make Vegan Meringue: In a large bowl, whip aquafaba until soft peaks form (~5 minutes). Add cream of tartar and keep whipping. Slowly add powdered sugar and beat until stiff, glossy peaks form.
Top & Brown the Meringue: Spread meringue over the chilled pie. Use a blowtorch to gently brown the top (or broil in the oven for a few minutes).
Serve & Enjoy! Chill briefly before slicing for the perfect set!