Slice potatoes thinly and soak in water to remove excess starch. Drain. Slice bell pepper thinly after removing seeds and stem.

Mix ketchup, tonkatsu sauce, and salt and pepper in a bowl to create the seasoning mixture.

Heat olive oil in a pan over medium heat. Cook ground pork until browned. Add potatoes and bell pepper, cooking until potatoes become slightly translucent.

Add the seasoning mixture to the pan and stir to combine. Remove from heat and let cool.

Place 1/8 of the filling and cheese onto each spring roll wrapper. Roll tightly and seal the edges with the flour-water mixture. Repeat for all wrappers.