On which days are vegetable beef days served?

Vegetable beef days are specifically served on Monday and Tuesday as part of Denny's menu offerings. This scheduling allows customers to enjoy this particular dish at the beginning of the week when they may be looking for hearty, comforting meals. This practice also helps in managing the inventory and providing variety throughout the week. In contrast, the other days listed do not include vegetable beef as a part of the regular offerings, thus making Monday and Tuesday the correct choice for when this dish is served.