Yes, you can, but only small amounts will fit in the operated stomach.
You also need to make sure you eat protein-rich foods first, followed by vegetables, and then if there is room, carbohydrates.
For example, a meal during the transition from the liquid phase to normal eating might look like this: a piece of steamed fish about the size of a palm, one to two tablespoons of soft-cooked vegetables, and one to two tablespoons of mashed potatoes.
Here, you should eat the fish first to ensure protein intake, then the vegetables, and finally the carbohydrates.