Prepare the prawns
If the prawns are wet, pat them thoroughly dry with paper towel.
This is particularly important if you're using thawed frozen prawns.
Excess water cools the oil and encourages the prawns to release liquid rather than cook quickly.
Season lightly with salt.
Prepare the garlic
Thinly slice the garlic rather than mincing it.
Six cloves might look like a lot, but garlic is one of the defining ingredients of the dish.
Try to keep the slices reasonably even so you don't end up with some pieces burning while others are still raw.
Flavour the oil
Add the olive oil and sliced garlic to a frying pan while it's still relatively cool.
Place over medium-low heat.
Let the garlic gradually come up to temperature with the oil.
Once it begins gently sizzling, add the fresh chilli and optional chilli flakes.
Cook for around 2–3 minutes, stirring or swirling occasionally.
The garlic should become fragrant and lightly golden, not dark brown.
Add the paprika
If using paprika, add it now and stir for only about 10 seconds.
Don't fry ground paprika aggressively in hot oil because it can burn and become bitter.
The paprika is optional. I only want enough to add a little warmth and colour rather than turning this into another paprika-heavy prawn recipe.
Increase the heat
Increase to medium-high.
Once the oil is properly hot, add the prawns in a single layer.
They should immediately begin sizzling.
Cook the prawns
Cook for approximately 60–90 seconds on the first side.
Turn and cook for another 45–60 seconds, depending on their size.
The prawns should be opaque and just cooked through.
Don't keep cooking them because you're waiting for the sauce to thicken.
There isn't really a conventional sauce here.
The flavoured olive oil is the sauce.
Finish
Remove the pan from the heat.
Add the parsley and 1 teaspoon lemon juice.
Toss everything together.
Taste the oil.
Add the remaining lemon only if you think it needs more acidity, then adjust salt and black pepper.
Serve immediately
Transfer everything, including all of the garlic-chilli oil, into a warm shallow dish.
Serve immediately with crusty bread and lemon wedges.
Make sure everyone gets some of the garlic oil.
That's half the point of making it.