Here are a few suggestions on some of your questions.
Regards,
- Great thing you tested this out before going public
- As for testing the surface temp of your griddle I suggest an infrared laser there are inexpensive and highly accurate.
- If you are using this griddle outside is your area heated? If not you will need to heat your area (obviously in the cold months only). I have a similar problem roasting coffee outside the temp of the roaster does not stay consistent in the colder months. Also, keep in mind that each time you introduce product to the surface it will cool the griddle. I would try prepping a crepe and start out by testing the temp of the griddle before, after and then how long it takes to heat back up to that temp.
- You should have your griddle raised on a heat resistant surface preferably a stainless steel for sanitation purposes.
- For the nutella keeping it warm keep get a small baine marie (steam table) or hot plate and place this in one stainless steel container in another with hot water. Does that make senses?
- As for pre-making your crepes you should be able to we used to do this for desserts but, you do lose some of the charm of having the crepe prepared in front of you.
- As for your food cost you MUST figure this out before you even get started. This is a pretty straight forward process of coming up with a recipe and making 10 crepes and costing out the ingredients and coming up with what you need to make a profit. Don't forget overhead (electricity, gas, labor).
Regards,