Melt unsalted butter in the microwave or on the stove.
16 Tbsp unsalted butter,
In a bowl, whisk together the eggs and sugar, then whisk in the melted butter.
3 eggs, 1 cup sugar
In a separate small dish, juice the lemon and add the baking soda. Let it foam then add into the bowl with eggs and sugar.
½ lemon,, ½ tsp baking soda
Add the flour and cornstarch to the bowl. Mix everything with a spoon until well combined. The dough should not be super runny.
1 cup all purpose flour,, 1 cup corn starch
Heat the walnut cookie maker. Once it's ready, place ¼ teaspoon of the dough into the shells and close the machine.
It will take about a minute for them to cook and be golden. Once finished, take each nut out and place onto a cutting board or counter for quick cooling. If there is too much dough around the walnuts, cut off the extra.
Place the cooled nut half into a bowl as you finish the rest of the batter.
Fill each nut with the cooked dulce de leche and bring two halves together to make a whole. Enjoy!
1 can dulce de leche,