Recipes can be unlocked by playing Matches and earning XP. As you gain XP, you'll also progress through Episodes, which will reward you with access to new ingredients to experiment with for new recipes!
To unlock a family of recipes, you'll first need to unlock the signature ingredient. For example, to unlock burger variations, you'll first need to unlock Burger Buns.
To unlock the recipe for a specific dish, you'll need to have unlocked all of the ingredients needed for that Dish (including the signature ingredient).