reheat the oven to 180°C fan (200°C conventional).
Pat the duck dry and season well. Place the Marylands skin-side down in a cold, ovenproof pan.
Slowly render the fat over medium heat for 10–12 minutes until the skin is golden and crisp. Flip and cook the flesh side for 2 minutes, then remove to a plate.
Pour off excess duck fat, keeping 1–2 tablespoons in the pan.
Add the shallot and cook for 1–2 minutes. Add garlic and thyme, cooking for 30 seconds.
Deglaze with vermouth (or red wine), scraping up browned bits. Add vinegar and sugar if using. Reduce for 2–3 minutes.
Add cherries and toss to coat. Add stock if using and bring to a gentle simmer.
Return the duck to the pan, skin-side up, keeping the skin above the liquid.
Transfer to the oven and cook for 25–35 minutes until tender.
Rest the duck for 5 minutes. If the sauce needs thickening, simmer for 2–3 minutes.
Optional: whisk in cold butter for a glossy finish.
Add duck back into the pan to just warm through and serve.