There are several ways you can get coins for your restaurant.
  1. Finding and opening roadside gifts: you can find these gift boxes both in your own restaurants and other players' restaurants.
  2. Serving customers in the Restaurant
  3. Play every day to win coins as a bonus!
  4. The Mocktail Counter earns you coins in time. Unlock more slots for more coins.
  5. Participating in events may reward you with various rewards, of which coins is also a possibility.
  6. Sell your products in the Chef Store! You can adjust the selling price to have the best offer in the market!
  7. Watching ads on the TV can earn you coins every once in a while (only on Android and iOS devices)
  8. Visiting and trying your luck at the Fortune Hut earns you coins sometimes 
In addition to all that, you can always buy coins by tapping on the "+" button next to your coin balance at the top of the screen.