A.T. Robertson Commentary Matthew 15:36

"and he took the seven loaves and the fishes; and he gave thanks and brake, and gave to the disciples, and the disciples to the multitudes." — Matthew 15:36 (ASV)

Gave thanks (ευχαριστησας). In 14:19 the word used for "grace" or "blessing" is ευλογησεν. Vincent notes that the Jewish custom was for the head of the house to say the blessing only if he shared the meal unless the guests were his own household. But we need not think of Jesus as bound by the peccadilloes of Jewish customs.