SAUCE PREPARATION: IN A SMALL BOWL, WHISK TOGETHER THE YOGURT, LIME JUICE,GINGER, MUSTARD, OIL, AND CUMIN. SET ASIDE SALSA PREPARATION: IN A SMALL BOWL, MIX THE PAPAYA, SWEET RED PEPPER, CHOPPED CILANTRO, LIME JUICE, HONEY, AND GROUND RED PEPPER. SET ASIDE. TUNA CAKE PREPARATION: IN A LARGE BOWL, COMBINE EGG SUBSTITUTE, TUNA, SCALLIONS, 2/3 OF BREAD CRUMBS, AND 1/4 CUP OF THE GINGER SAUCE. MIX WELL. SHAPE INTO FOUR 1/2 INCH THICK PATTIES. COAT WITH REMAINING 1/3 CUP BREAD CRUMBS. HEAT LARGE NON-STICK FRY PAN OVER MEDIUM HEAT, WARM THE OIL. ADD TUNA PATTIES AND SAUTE FOR 3 MINUTES PER SIDE, OR UNTIL GOLDEN BROWN. TRANSFER TO INDIVIDUAL PLATES. DRIZZLE WITH REMAINING GINGER SAUCE. SERVE WITH THE SALSA AND GARNISH WITH THE CILANTRO.