To make a vegetarian version of Omurice, you can substitute the chicken with tofu or a mix of your favorite vegetables like mushrooms, zucchini, and bell peppers. For a vegan option, replace the eggs with a chickpea flour mixture or a store-bought egg substitute, and ensure that the sauces used are vegan-friendly.

Omurice pairs well with a variety of side dishes. Consider serving it with a simple salad, pickled vegetables, or miso soup for a complete meal. You can also add a side of steamed broccoli or a light cucumber salad to balance the flavors.

To store leftover Omurice, let it cool to room temperature, then transfer it to an airtight container. It can be kept in the refrigerator for up to 3 days. To reheat, simply microwave it until heated through, or you can reheat it in a pan over low heat, adding a splash of water to keep it moist.

Yes, you can use brown rice instead of white rice for a healthier option. Just keep in mind that brown rice takes longer to cook, so adjust your cooking time accordingly. The flavor will be slightly nuttier, but it will still work well with the other ingredients.

If you don't have tomato ketchup on hand, you can substitute it with a mixture of tomato paste and a little sugar to mimic the sweetness of ketchup. Alternatively, you can use a homemade sauce made from pureed tomatoes, vinegar, and a pinch of sugar for a fresh flavor.