Looks delicious! There are a couple of techniques to get good pics of food; here are a couple I can think of off the top of my head:
Take the picture in an area void of distractions like an empty table
Center the item of interest in the middle of the plate and make sure it's clean of crumbs or fingerprints
Use garnish to make colors pop (e.g. like green chives on white mashed potatoes)
Take the pic in good lighting, sunlight from a window is best
Get close enough to the food to fill the whole frame, leaving a little space on the edges . Get even closer to get good food textures