The neutron star.
Ingredients:
One large, well matured star (As small as 8 solar masses to 20 solar masses)
That's it....
Method:
Turn up heat to 100 million Kevin.
This allows Helium and other heavier elements to begin fusion, bringing the more complex elements in the dish to the fore. Reduce the mixture for around a million years. Now you should see characteristic "onion" layers forming, with light hydrogen on the outer shell getting denser and chewy towards the iron, inner core.
At this stage the mixture will separate violently. Don't be alarmed, this is normal, and if you're wearing a welding mask and a reinforced apron you might finish this unharmed. Be sure to skim off the rich mixture of compounds on the top: they contain bags of nutrients useful for other recipes, try making a Earth like planet or a couple of comets as starters or appetizers.
Now, massive gravitational forces start to kick in, contracting the bulk of the mixture until the subatomic particles within it are forced to combine together into neutrons to save space. The repulsion between all these neutrons is just enough to stop gravity take over entirely and making a black hole , leaving you with your finished super dense patty: a sphere 20km in diameter made entirely from neutrons.
WARNING
This star’s mass fits into 20km in diameter and is super dense. Don’t give you gests large portions unless you want them to fall through the Earths crust.
Hmmm. Scary. 
