Step 1

For jam, simmer quince and 2 litres water in a deep saucepan until tender (1½-2 hours). Purée quince, then pass through a sieve into a saucepan and bring to a simmer. Add sugar, stir to dissolve and simmer mixture until it’s dark pink, thick and glossy, and jam sticks to a chilled plate when dripped (1-1½ hours). Add thyme and 1 tsp cracked black pepper, pour into a sterilised 800gm jar and store in a cool place. Cloudy quince jam will keep for up to 2 months.

Step 2

For crackers, preheat oven to 180C. Finely grind sunflower seeds in a food processor, add psyllium husks, baking powder and 1 tsp sea salt, and process to combine. Add sesame seeds and cheese and, with the motor running, gradually add oil and 1 tbsp water, and process until mixture starts to clump together (1-2 minutes). Turn out onto a sheet of baking paper, bring dough together, flatten, then place another sheet of baking paper on top and roll out to 2mm square. Remove top sheet and score diagonal criss-cross indentations in pastry with a knife or pizza cutter at 10cm intervals to form 16 even diamond shapes, then, still on baking paper, transfer to a baking tray. Sprinkle with sea salt and black sesame seeds and bake, turning tray halfway through cooking, until golden brown and crisp (15-20 minutes). Cool on tray, then break at indentations and serve with Manchego cheese and cloudy quince jam. Seed crackers will keep stored in an airtight container for up to 2 weeks.