Harvest Moon: A Wonderful Life Special Edition

You can cook inside your house. Simply approach the kitchen and press . You start with the Salad and Soup options, and unlock more cooking options, including the Entrée, once you've cooked around ~20 dishes.

I recommend you grow some turnips and turn those into Light Pickles as each of those requires only a single turnip and no other ingredients. Simply press the right half of the once you've selected your turnip to start the cooking process with 1 instead of 3 ingredients. After around 20 Light Pickles, you should finally be able to cook Entrées.

The easiest Entrée to make is Sashimi, which only requires a single fish. Sashimi is also a good way to make some additional money from the fishes you catch as it sells for 150g pre-haggling at Van's Shop, and even more if you haggle with him. So if you don't need your fishes as presents for the villagers, turn every fish that's worth less than 150g into Sashimi before you sell it.