The most important thing to note is that, to achieve a perfect order, it seems you must have had some involvement in it. That is to say, even if you hire a chef and a driver, and train them both up to be masters so that you get perfect feedback for every order, the only way you can add to your 'Perfect' rating is to perform one of the two jobs - preparing or delivering - yourself.

So, you either have to prep/cook, or deliver. I've found it much easier to focus on delivery rather than prep as a way to get a perfect order. If you think of preparing orders and delivering orders as two separate mini-games, the latter is much easier as it stands right now, simply because driving a vehicle is all about practice and you quickly get a feel for the map, the speed limitations and the car handling. Preparing orders, meanwhile, is more difficult, because the current feedback system means it's largely about guesswork. All you're told is "too many toppings", "too few toppings", perfect, bad, or OK. The developers have been taking on board feedback about this, which is great, so I may have to change this advice in future.

If you're going to get perfect orders, the first thing to do is get to the point where you can hire a chef to take care of the pesky prep. Fulfil enough orders to the point where you can upgrade your shop, and you'll suddenly get some hiring options. Go for the chef and then build his experience as fast as you can to "Master" level. There are two ways to build experience: you can either pay $10 per hour to train him, or you can let him complete orders to build his experience more slowly, but for free. Personally, I put the guy into training as soon as I got him, and my balance didn't seem to take a major hit as a result.

Once you've built your chef up to "Master" level, he's probably going to start getting unhappy, which I'm sure, in turn, affects energy levels and therefore productivity. I found that bumping his salary up immediately to $17 dollars did the trick - he remained permanently happy after that (bearing in mind I only have one store and have completed the conservative Presidency plotline - I don't yet know how much other events might change this).

Once your chef's up to scratch, just make sure that you take every opportunity to deliver the orders. At first glance, this is the harder mini-game, because the vehicles are somewhat over-responsive. But practice makes perfect, and you'll soon find you get better at it. The main tips:

• Upgrade to the yellow car as soon as you can - it's faster, and it can handle bumps (e.g. into lampposts) much better without taking damage.
  
• I didn't bother upgrading to the red sports car - yes, it's faster and it can handle turns better, but by the time it came available I'd got used to the yellow one, which is just as adequate for achieving perfect delivery times to every location.
  
• Whichever car you drive, don't take turns at more than 40 miles per hour. 30-38mph seems to be the sweet spot.
  
• Learn the layout. There are quite a few dead ends on the map, which you should quickly learn to avoid. As a rule, whichever way the arrow is pointing, it's usually better to take the furthest turning towards it. This isn't always the case, though, and only practice makes perfect.
  
• Look UP. The green parking zones have very high barriers. This means that you can quite often see them over the trees and buildings, and around corners. Don't look at the road while you're driving - make sure you're scanning the horizon for the green markers. It'll help you navigate.
  
• Sidewalks are shortcuts. You'll quickly notice that it's easier to get to some locations (e.g. the garage) by driving directly over the sidewalk. You should definitely do this - just make sure you take the sidewalk HEAD-ON at a low speed - otherwise, you'll spin and flip (though you should do this once, so you get the achievement).
  
• Timing is everything. When you begin a delivery mission, look at the time allowed. A time of two minutes or more (generally speaking) means that you're heading to the furthest part of town. Meanwhile, a time limit of a minute or less means that the goal is literally right around the corner. If you note the time limit each time you drive, you'll quickly learn to link it to the right location, as every one is unique.
  
• Even if you've hired a delivery man, you can still choose to deliver yourself when an opportunity becomes available. If he's not on training or vacation, then you'll both deliver simultaneously and the order will attract twice the normal delivery cost (of course, this has the feel of a bug to me, so the devs will probably soon fix it!).

If you follow the above tips, you should start accruing perfect orders in no time. But I admit that all of the above depends on delivery, which ignores a large portion of the game - preparing food - that is definitely fun too.

I haven't fully explored that side of it, but I've found that the following, in the early game at least, tends to be true when creating perfect orders:

• Coverage matters. The game seems to penalise you for large amounts of base left exposed.
  
• Pizza toppings are quantitative. I'm still experimenting, but I've found that 10 of a topping for "a little", 20 for a normal amount, and 30 for "a lot" generally means a higher chance of a perfect prep rating. This isn't always the case, though: some of the larger and more advanced toppings need fewer clicks, so the ideal amount may also be linked to surface area and strength of flavour.
  
• Wings are easy - just cover each one with a single application of sauce.
  
• Bread is simple, too: whether cheese or garlic, share two servings among each pair of sticks, lining them up for maximum exposure.
  
• Sandwiches and pasta, I still have no idea - this is why I focus on delivery

I'm sure I'll add to this list in future, but these are the steps that have served me well so far. I hope you find them useful!

And if the devs are reading: you've created a brilliant game here. Its seeming simplicity is addictive, and gives way to a much more complex game than you realise at first. It reminds me most of Cook, Serve, Delicious - though it's actually a lot better than that title. Bravo!