I tend to ignore tantrums at this age and redirect as much as possible to a more appropriate behaviour. You could try distracting him by singing a song or something if it is at mealtime. I have a little one who threw a lot of fits for the first two months she was with me (15-17 months), but I ignored the tantrums wherever possible or put her somewhere safe when need be and continued to ignore and now she is really good most of the time (she's now 20 months).