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Bistro Bay
For most of the game I played only high business days (level 3 or 4).
I tried restarting when I got a challenge that wanted me to spend money I didn't want to spend (like doubling ingredients I didn't need, upgrading decor beyond the first sign, or learning a recipe for items not in demand). Always buy the silly gorilla advertisement!
Use your first recipe as long as you can, even if the demand item changes, and charge as much for it as you can get away with. Lower the price when it does not contain the demand item. People will buy it because thay have no choice! LOL!
You have to have a busy day if you are asked to sell something at a premium price.
Once you have served 50 meals to 2-3 different customers, buy the $1000 restaurant. Get its sign as soon as you can without shorting your needed ingredients.
Just work off of a couple of recipes at the 1st and 3rd restaurant. Try to offer all dishes with the demand ingredient when you can, but don't buy a recipe if you can't afford its ingredients too.
I didn't buy the middle restaurant until the challenge told me to. You may need to do this sooner (if you have around $2000 I would guess).
At this point or shortly after, write down the cost of all the recipes you still need. Add each location separately and add them all together. Now you have a money goal that you can actually see.
I continued just buying a new recipe if I didn't have one for the demand item at every restaurant. Obviously, you make more money when you sell what they are craving that day.
I usually set the prices in the middle of the regular range until I just needed a few more happy customers. Then I sold things at one click below premium.
When you only have 2 or 3 customers whoneed to get their 50 meals, don't sell their favorites until you have eough money to get all the recipes. As long as you have one customer creeping along, you'll have time to buy them all.
I kept Diane waiting, and didn't sell her favorite dish  until everyone else was done.
As long as you have enough ingredients to sell her, or whoever, a couple of dishes a round, you'll be okay.
Once you get the recipes purchased, you do get the medal even if you get defeated by Grub Burger.
 
The knight will buy the Seafood Ice Cream (yuck!!) no matter how much you charge.
The cell phone addict will almost always buy the Landlubber Soup. Sometimes he gripes about the price.
Buy the Beef Salad for the weight lifter (sell high).
Diane likes the Veal Orloffski. I didn't sell it until she was the only customer left to get 50.
 
Good luck, MP!