Prepare the Lemon: Wash the lemon thoroughly. Using a fine grater, zest the lemon to collect its vibrant outer peel. Be careful not to grate too deep into the white pith, as it can be bitter. After zesting, cut the lemon in half and juice it. Set both the zest and juice aside.

Mix the Condensed Milk and Lemon: In a large mixing bowl, combine the sweetened condensed milk with the freshly squeezed lemon juice. Stir well until the mixture starts to thicken slightly. The acidity of the lemon juice will help the condensed milk achieve a smooth, creamy consistency.

Whip the Cream: In a separate bowl, pour in the heavy cream. Using a hand mixer or stand mixer, whip the cream on medium-high speed until it forms stiff peaks. This should take about 3-5 minutes. Be careful not to over-whip, as it can turn into butter.

Combine Cream and Lemon Mixture: Gently fold the whipped cream into the lemon and condensed milk mixture. Use a spatula to combine the ingredients, ensuring you maintain the airy texture of the whipped cream. Mix until everything is well incorporated and smooth.

Prepare the Toppings: Chop the chocolate and peanuts into small pieces. You can use a knife or a food processor for this step. The goal is to have small, even pieces that will add texture and flavor to the dessert.

Assemble the Dessert: Pour the creamy lemon mixture into your serving dish. Sprinkle the chopped chocolate and peanuts evenly over the top. For an extra touch of elegance, you can also add a sprinkle of lemon zest on top.

Chill and Serve: Place the dessert in the refrigerator for at least 2 hours to allow it to set and the flavors to meld. Once chilled, serve the dessert in individual portions. Enjoy the refreshing and decadent flavors as they melt in your mouth.