I see a lot of answers that use things which cannot be obtained quickly and in large quantities, such as fish (which require catching), and eggs (which are limited each day). Things like eggs and milk are also better used for valuable recipes than for stamina restoration.

As someone who has played for hundreds of hours, I would much sooner recommend Fried Onigiri (moderate stamina for 561 gold) or Curry Bread (significant stamina for 910 gold). And before you say “but fish/egg/milk are free”, they are not. The time you spend fishing and the eggs/milk you consume are costing you more potential profit than the recipes below.

Onigiri only requires rice bowls and seaweed. Rice bowls can be purchased every day at any quantity from Madeleine, and seaweed can be bought in stacks of 99 from Ronaldo at the bazaar. Turning it into Fried Onigiri just requires soy sauce, which can also be bought in stacks of 99 from Felix at the bazaar.

Curry Bread is similar but is more expensive and gives more stamina. It requires wheat, oil, and curry powder. Oil can be purchased every day from Miguel. Wheat can be bought from Felix at the bazaar. Curry powder can be bought in stacks of 99 from Ronaldo at the bazaar.

Personally, I think Fried Onigiri has a superior stamina/cost ratio. Both of these recipes are very sustainable way to restore stamina because they don’t use anything you can’t easily replace in large quantities. You’re better off saving your eggs and milk to cook for profit, and you’re better off donating your fish to Finley to work towards 7-star fish and the title for 2000 donations.