Step 1

Preheat the oven to 350°F (177°C). Line an 8 x 4 inch loaf baking pan with parchment paper.

Step 2

In a large mixing bowl, whisk together the melted butter and sweetened condensed milk until fully combined. Add lemon juice and zest, stirring until smooth. The lemon juice will immediately thicken the mixture.

Step 3

Add the flour to the wet mixture, folding it in with a spatula until the flour is fully combined and there are no pockets of unmixed flour or streaks of flour paste. Make sure to only fold it in with a spatula so that you don't overmix the batter.

Step 4

Pour the batter into the prepared baking pan, spreading it evenly across and smoothing the surface with a spatula. Bake in the preheated oven for 40-45 minutes, or until the surface is brown and a toothpick inserted into the center comes out clean. When you apply light pressure on the surface of the bread it should bounce back instead of sinking in.

Step 5

Allow the bread to cool completely in the pan before cutting and serving. If desired, you can also drizzle or spread a lemon glaze on top before serving. Store uneaten bread in fridge or freezer.