I guess a solution could be adding a "stir" functionality. So basically, you add your ingredients, invoke the stir action (maybe with a nice animationand how do you do it without making player feel like it's some bug because nothing happened after adding 3 ingredients? adding 3 with the current amount of ingredients available is already a ton of possible combinations, and most of them are still yet to be utilised, there's nowhere near a need to pack in additional ingredients to the combinations