Or, if you are offering something similar, determine what you are doing different so that you can create your own niche in the market.
Food service and restaurants can be tricky in terms of margins and profitability, and dependent on a number of factors including location, overhead, the systems you have in place to guarantee "quick service/fast food" delivery and the price points you can offer in your area.
There are a number of restaurant consultants who can work with you to see what could be possible in your particular market, however be wary about chasing the latest trend or "taste," as those concepts can fade as quickly as they seem to grow.
You can also test your ideas by starting small. Depending on what you're looking to do (and your background in food service, which I presume you have), you might be able to partner with a catering service to offer sample cuisines, or you may even be able to set up a food booth at a local outdoor market or similar type venue (depending on your local codes, laws and regulations) to see what types of food people want to eat and are willing to buy.
Whatever you do, never pay retail for your restaurant set up -- unless you are looking to buy into some type of franchise system -- as you can find great deals in this category for those who have gone before and who didn't do the type of legwork, research and market testing you need to do to see if your ideas are indeed viable.
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Brad Sugars is the founder and chairman of ActionCOACH. As an entrepreneur, author and business coach, he has owned and operated more than two dozen companies including his main company, ActionCOACH, which has more than 1,000 offices in 34 countries.