This is a rough guide as I'm having problems with the game.
Goal 1: Rocket Red
SERVE 60 Filipino Paellas (2 hrs)
ASK for 6 Metal Plates
ASK for 6 Bolts
Goal 2: Place Your Rocket Red!
PLACE your Rocket Red Mega Stove!
Goal 3: Royal Blue!
SERVE 40 Corned Beef
ASK for 7 Copper Wiring
ASK for 7 Gas Pipes
Goal 4: Place Your Royal Blue!
PLACE your Royal Blue Mega Stove!
Goal 5: Racing Green!
SERVE 40 Bacon Wrapped Scallops
ASK for 8 Heating Coils
ASK for 8 Control Knobs
Goal 6: Place Your Racing Green!
PLACE your Racing Green Mega Stove!
Goal 7: Pearl White!
SERVe 30 Gem Cakes
ASK for 9 Burner Rings
ASK for 9 Handles
Goal 8: Place Your Pearl White!
PLACE your Pearl White Mega Stove!
Goal 9: Midnight Black!
SERVE 20 Cocoa Cayenne Cupcakes
ASK for 10 Drip Pans
ASK for 10 Thermostats
Goal 10: Place Your Midnight Black!
PLACE your Midnight Black Mega Stove!
They'll give you a blue or green or red stove etc to place in your cafe each time you complete the main set of goals as above.
And you'll see the coloured stove icon pop up at the side. One for red stove, one for blue etc.
And you need to complete the coloured stove goals to unlock each burner of the 4x stove.
There's 2 x 4 goals in order to get each of the 4x stoves.
There are 5 coloured stoves to get.
When you are done, you get 5 coloured 4x Megastoves (which cook at 90%).
You need to complete one more goal to convert them to Ultra Stoves (which cook at 50% speed). Details on how to unlock the stoves are here.