Preheat your oven to 200C (390f)
Peel the papery layers off the bulb of garlic and cut the top off horizontally to expose the cloves.
Drizzle with olive oil, wrap in aluminium foil and roast in the oven for 40 - 50 minutes until caramelised.
When it has cooled enough to touch, squeeze all of the garlic out and set aside to add to the pesto ingredients.
In a food processor combine the red peppers, pine nuts, garlic, and thyme until coarsely chopped.
With the processor running, slowly drizzle the olive oil in until well emulsified.
Add the parmesan, salt and pepper and mix in by hand.
Set aside, until ready to use.
Get your pasta cooking in a pot of well salted boiling water.
Put the pesto in a big mixing bowl and add the cooked pasta straight into it.
Thoroughly toss the pasta and the pesto together until well mixed and serve immediately topped with freshly grated parmesan.