In a large mixing bowl, add the 4 packets of lime gelatin and pour in the hot water. Stir thoroughly for a few minutes until the gelatin is fully dissolved.
Next, add 1½ cans (21 oz / 590 g) of sweetened condensed milk to the gelatin mixture. Mix well until smooth and fully incorporated.
Pour the mixture into a lightly greased bundt pan or silicone mold. Transfer it to the refrigerator and chill for about 4 to 6 hours, or until firm.
Condensed Milk Topping:
In a small bowl, combine the remaining 7 oz (200 g) of sweetened condensed milk with the juice of 1 lemon. Stir until smooth and creamy.
To Serve:
Once the gelatin dessert has set, carefully unmold it onto a serving plate. Pour the condensed milk topping over the top, spreading evenly.
Finish by sprinkling fresh lemon zest for an extra burst of citrus flavor.
