In a pan over medium heat, heat about 1 tablespoon of oil. Add onions and garlic and cook until softened.
Add ground pork and cook, breaking up to small pieces with the back of a spoon, for, about 8 to 10 minutes or until lightly browned.
Add soy sauce and continue to cook, stirring regularly, until meat is cooked through. Season with salt and pepper to taste.
Remove meat from pan and in a colander, drain any excess liquid. Allow to cool to touch.
Peel bananas. With a knife, make an incision on one side of the bananas.
Using a spoon, gently stuff the banana with the cooked meat.
In a small bowl, combine flour and water. Whisk together until smooth and well blended. Spoon mixture over stuffed bananas to cover meat filling.
In a pan over medium heat, heat about 2 inches deep of oil.
Gently place bananas stuffed side up into the hot oil. Cook for about 3 to 5 minutes or until golden brown. Occasionally spoon oil on top of the bananas to cook and brown.
Remove from heat and drain on paper towels. Serve warm.