In my hay days, many moons ago, I experimented with solar cooking here on the island. I used an old 1.8 meter satellite dish covered with reflective tape. It was quite the hassle to cook with this contraption. Don't get me wrong It was plenty hot but the heat was on a very localized spot. For boiling water or frying eggs it was great. For anything that required a longish cooking time it was not so good and the dish needed to be repositioned as the day progressed and the position of the sun changed. For cooking a typical dominican style lunch this is basically a no go.
Here is a review of some solar cookers.
If intended use is rural areas, 'el campo', a better solution might be a type of rocket stove. They work off twigs and fallen tree branches and can be made from a paint bucket a bit of rebar and concrete. These materials are abundant here and the local know how to work with them.
Maybe even a paint gallon can stove that also work from twigs.