Preheat the oven
Preheat the oven to 220°C conventional / 200°C fan.
Line a baking tray with baking paper.
Prepare the grapes
Remove the grapes from their stems and place them in a bowl.
Add:
1 tbsp olive oil
4 thyme sprigs
Black pepper
Small pinch of salt
Toss until lightly coated.
Roast the grapes
Spread the grapes over the prepared tray in a single layer.
Roast for 15–20 minutes.
You're looking for grapes that have softened and blistered, with some beginning to collapse or split.
There should also be a small amount of concentrated grape juice collecting on the tray.
Don't discard it.
Prepare the halloumi
While the grapes are finishing, drain the halloumi and pat it thoroughly dry.
Cut into approximately 8–10 mm thick slices.
I'd rather have reasonably thick pieces than thin slices. Halloumi needs enough thickness to remain soft inside after the outside has browned.
Heat the pan
Heat a large frying pan over medium-high heat.
Add 1 tsp olive oil and spread it very lightly across the pan.
Halloumi doesn't need much additional fat.
Brown the halloumi
Add the halloumi in a single layer.
Cook without moving for approximately 1½–2 minutes.
Once deeply golden underneath, turn and cook the second side for another 1–2 minutes.
Remove from the heat as soon as both sides are browned.
Don't continue cooking it while waiting for everything else.
Add lemon to the grapes
Remove the roasted grapes from the oven.
Discard the woody thyme stems.
Add 1 tbsp lemon juice and gently toss the grapes through their roasting juices.
The lemon should balance the concentrated sweetness rather than make the grapes taste sharply acidic.
Assemble
Arrange the hot halloumi over a serving plate.
Spoon the roasted grapes around and partially over the cheese.
Make sure to spoon over the juices remaining on the baking tray as well.
Finish
Scatter over:
Lemon zest
Fresh thyme leaves
Freshly cracked black pepper
Finish with a very small drizzle of extra virgin olive oil if you think it needs it.
Serve immediately while the halloumi is still hot.