First you need to adjust your camera’s aperture
Set your camera in Aperture Mode (Av)
If you want your camera to focus on a specific object and the background is blurry, you need to adjust your camera’s aperture in to a small number. This would work really good for food.
And if you want everything to be clear your need to set your aperture to a larger number, since it will allow more light to come in
The picture on the left shot at f/2.8 and the right one is f/8
You can see the difference.