Radish Meringue is a dish from the popular cooking game "Cooking Mama." While Neopets has its own cooking games, like the "Food Club" or the "Cooking Academy," Radish Meringue isn't a recipe you can make on Neopets.
If you're interested in other Neopets cooking options, try exploring those games or looking for recipes on the Neopets wiki. You can also use the Neopets "Search" function to find other cooking-related content.