Cut the crusts off each slice of bread. Smear some peanut butter on 1 side of the bread slices. Put some of the sliced bananas on top of the peanut butter and cover with another slice of bread to make a sandwich.
In a deep-fryer or heavy-bottomed pot, heat enough canola oil to come halfway up the sides of the pot, to 350 degrees F.Put the panko crumbs in a wide shallow bowl.
Prepare the tempura batter according to the package directions. Dip a sandwich in the batter, then roll it in panko crumbs, and deep-fry until golden brown. Repeat with the remaining sandwiches. Cool and drizzle with your favorite honey. Serve.