Depends where you’re at. If you’re not too far from forests and meadows, mushrooms, grasshoppers and herbs.

Other than that, rice, noodles. You can add the above things to your rice and noodles.

You can cook your noodles in tomato sauce like spaghetti al‘assassina to get some variety.

Remove wings and legs from grasshoppers before eating, they’re scratchy.

Only eat mushrooms and herbs you’re certain they’re not poisonous.

Beans/legumes can be cheap