The Onigirazu - Spam and Egg (スパムたまごおにぎらず) is onigirazu with Spam and fried egg; Okinawan-influenced flavor.
It sits within the Pocket Sandwiches family of French sandwiches — specifically the The Onigirazu cluster, which gathers the regional and stylistic variants that share its frame.
For the broader The Onigirazu tradition that frames this sandwich, see The Onigirazu.