A simple one, but...
A microwave meal! The problem with cookers and hobs is that they always rely on these pesky things called atoms (and we are too sophisticated for those). In our vacuum of space, convection and conduction are a thing of the past! Relying on a flame to heat a metal pan is great, but you need oxygen for flames and, well, we haven't got much of that. Also the heat is transferred from the pan to the food using conduction, but our food would need to be in contact with the metal to receive the heat and this won't do because in zero G it would float off! No, that won't do...
Aha! But light doesn't use particles! (Well, arguably wave-particle duality does but those are different to the particle to which I refer.) A simple microwave will perform the jobs we need it to:
- It will contain our food, so we don't need to worry about it floating off and possibly crash-landing on a distant moon.
- The microwaves will heat the water molecules in our food, all without needing one of those pesky atmospheres.
- You can easily find a microwaveable meal from a supermarket, and it comes in a handy container that you can eat it out of once it is heated up!
So there you have it. Space-Microwaves(TM)!
Response to Michael
If the question specifies outside a space ship, I assumed they meant next to, or within plug-socket-and-extension-lead range (assuming the ship has a power source). Considering that we can use "Anything that can be found in an ordinary kitchen. Utensils, electric cooker, toaster... " I would say that an arbitrary power source and fuel source for those appliances is assumed but not explained.
If not, then the only power source would be the sun. Last time I checked, solar panels are not found in your average kitchen and I dare say the average kitchen drawer does not contain enough AA and AAA batteries to power a microwave for several minutes. If there is no power source, your Space-Microwave(TM) will not work.
To cool your microwave, you can take the outer surfaces off and press cold conductive materials onto the hot areas. These will take up some of the heat. Where to get those? Well, you could use the cooling element of a fridge but it uses compressed gases so that wouldn't work. You could put a large chunk of cold metal against it though. Wait, is there not a space ship? According to NASA:
Without thermal controls, the temperature of the orbiting Space Station's Sun-facing side would soar to 250 degrees F (121 C), while thermometers on the dark side would plunge to minus 250 degrees F (-157 C)
Well, grab the conductive elements of a cooker (or multiple cookers) and only microwave at night time, using the freezing cold cookers to absorb the excess heat.