The White Radish Cake costs 300 coins, and contains 335 servings, which can be sold for 6 coins per serving, for a grand total of 2,010 coins when sold. It cooks for one day.
While the White Radish Cake is available even to lower level players (it unlocks at level 3), you will have to do some serious level grinding to unlock access to the Level 70 and above Chinese Candy box.
According to Social Games Help, the Chinese Candy Box costs 6000 coins, and is ready after two days. It contains 2,000 servings, and is worth a total of 18,000 coins.