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["Combine the cookie crumbs with melted butter and a pinch of salt in a medium bowl, folding with a flexible spatula until the crumbs are fully moistened. Scrape into a 9-inch pie plate, then compress into an even layer with a flat-bottomed drinking glass or measuring cup, or by hand. Keep pressing until the crumbs are in a compact, even layer across the bottom and sides of the pan. Refrigerate until needed. (The crust can be made and held for a day or two if wrapped in plastic.)", "Fill a large pot with a few inches of water. Bring to a boil, then lower heat to maintain a simmer for a steady supply of steam. Crumple a long strip of foil into a thick ring and place ring into the water; this will act as a ""booster seat"" later in the process to keep the bowl from touching the water or the pot directly.", "Combine egg whites, sugar, salt, and lemon juice or cream of tartar in the bowl of a stand mixer. Place bowl over the water bath so it sits on the foil ring (the bowl should not touch the water or the bottom or sides of the pot). Cook, stirring and scraping continuously with a flexible spatula, until egg white mixture reaches 172u00b0F (77u00b0C). This should take about 8 to 10 minutes in a stainless steel stand mixer bowl; if it takes substantially longer, it simply means the heat is too low. If the mixture cooks too fast, or scrambles despite constant stirring, this indicates that the water has come to a boil, or that the water or pot is able to touch the bowl.", "When the mixture reaches 172u00b0F, transfer bowl to a stand mixer fitted with a whisk attachment and whip at high speed until meringue is glossy, stiff, and thick, about 5 minutes, although the timing will vary depending on the power of a given stand mixer.", "Once meringue is thick and stiff, whip the heavy cream and vanilla until thick and stiff, as well. This can be done by hand in a separate bowl, or in the original stand mixer bowl if the meringue is transferred to another container (no need to wash the bowl or whisk.)", "With an open balloon whisk or flexible spatula, gently combine the whipped cream and meringue, working carefully but thoroughly to ensure the mixture is well combined, but not deflated. Taste and season with additional salt and/or extract as needed. If you like, gently fold in chocolate or rainbow sprinkles to taste (about 1/3 cup if using the long, skinny ""jimmy"" style), working briefly to avoid overmixing the ""ice cream.""
