Grate the apples with the large side of a grater. Then press with your hands to squeeze out the juice.
In a very clean bowl, mix the condensed milk with the apple, egg yolks, and spices to taste (you can use a mix of the three, just cinnamon, or whatever you like).
Distribute the mixture in 4 glass jars, or ramekins, filling ¾ of each one.
In the Instant Pot® bowl, add 1 ½ cups of water, the rack and, on top, the jars or ramekins.
Close and lock the Instant Pot® lid. Make sure the steam release handle is turned to Sealing. Press Cake and set time to 20 Minutes.
When done cooking, press Cancel and turn the steam release handle to Venting. Once all the steam has been released, open the lid.
Carefully remove the jars.
While the apple is cooking, in a bowl, beat the egg whites with the sugar over a bain-marie over low heat until the crystals dissolve. Remove from the bain-marie and beat the meringue until the desired consistency is achieved (thick and bright white in color).
Top off the jars with meringue and brown with a kitchen torch.
Refrigerate until serving.
Optional: sprinkle with cinnamon powder before serving.