Rinse salmon and dry well. Remove bones and cut salmon into chunks.
Put 1/4 of salmon in food processor, along with mustard, shallots, soy sauce, ginger, garlic, and sesame oil. Process until a smooth paste, stopping several times to scrape down sides of bowl. Add remaining salmon and pulse machine off and on to chop salmon chunks and combine them with paste; don’t turn remaining salmon into paste — the remaining salmon should stay a 1/4 inch.
Scrape mixture into bowl. Add panko and pepper and hand mix into salmon. Divide into four parts and make patties.
Pan-fry in olive oil over medium high-heat until browned. Serve with tomatoes or avocados. 5. Patties can be covered well and refrigerated until ready to cook.