Peel, remove the seed and grate the unripe papaya. Get a piece of clean cloth and put the grated papaya inside the cloth then squeeze out the liquid. Season with salt and pepper and set aside.
To make the egg wash: Make a four slurry by combining flour and water. Beat 2 eggs in a bowl until frothy and add in the flour slurry. Beat again until well mixed and set aside.
Cook the longganisa by boiling it in 3/4 cup water in a pan until the liquid evaporates. Remove from pan and set aside.
Lay a piece of lumpia wrapper in a clean surface and brush with egg wash. Lay another piece of lumpia wrapper on top and smoothen it out by pressing the wrapper on the surface.
Put about 2 Tbsp of grated papaya forming a circular shape and hollow on the center. Get a piece of longganisa and remove the casing. Crumble it and put it on top of the grated papaya.
Crack one egg on the center of the grated papaya and brush the lumpia wrapper edges with egg wash.
Fold the lumpia wrapper to seal the filling and press the edges. Fold the edges to form it like an empanada.
Heat oil in the pan and fry the lumpanada until golden brown.