Start by juicing five large lemons to get fresh, tangy juice. Using a citrus juicer will save time and give you maximum juice. Slice two extra lemons into thin rounds for garnish. Fresh juice makes all the difference here, giving your drink that bright, zesty punch.
In a half-gallon pitcher, pour in the lemon juice and toss in your lemon slices. Add the sweetened condensed milk and agave. Stir well with a wooden spoon until the milk fully blends into the juice. This step is key for achieving that creamy, smooth texture without clumps.
Pour in about 2.5 cups of water and stir again. Taste and adjust by adding more condensed milk for creaminess or more agave for sweetness. Water is flexible—add less for stronger flavor, more for a lighter taste. Always adjust before adding the ice.
Finally, add plenty of crushed ice to the pitcher. This not only cools the drink instantly but also slightly dilutes it, balancing the tart and sweet flavors. Serve right away in chilled glasses, garnished with extra lemon slices if desired.