1.For salt-crust dough, mix flour, salt, eggwhite and 250ml cold water in an electric mixer fitted with a dough hook until the mixture comes together, then transfer to a floured surface and knead until smooth (2-3 minutes). Wrap in plastic wrap and rest for 1 hour.
2.If you’re using the oven, preheat oven to 190C. Roll out salt-crust dough to 5mm thick, place pumpkin in the centre and wrap in dough to cover it fully, pinching dough to seal. Pierce two small holes in the top of the pumpkin with a skewer, through pastry and into flesh, to allow steam to escape. Place pumpkin on a bed of rock salt in a baking dish and bake (or bury in the hot coals of the fire pit) until pumpkin is cooked and internal temperature on an inserted probe thermometer reaches 85C (1¼ hours for a 1.5kg
pumpkin and up to 1¾ hours for 2.25kg pumpkin). Set aside to rest for 20 minutes, then place on a tray or plate and crack open the pastry.
4.Reduce oven to 180C. Roast pepitas and sunflower seeds on an oven tray lined with baking paper or on a silicone oven tray until lightly golden (6-8 minutes). Leave to cool. Melt butter in a non-stick frying pan over medium-high heat until foaming. Add puffed quinoa, barley and wild rice, toss to coat, then add roasted pepitas and sunflower seeds, and toss to combine and warm through (30-40 seconds). Season to taste and mix for a minute off the heat. Keep warm or gently reheat to serve.
5.Slice pumpkin into wedges, remove seeds and fibrous centre and peel the skin away with a knife. The pumpkin should be meltingly soft and tender. Place a wedge on each serving plate, spoon cheese sauce on top, sprinkle generously with grains and seeds and serve.
Potimarron, a French heirloom pumpkin, is available from farmers’ markets. Puffed quinoa and barley are available from health-food shops or royalnutcompany.com.au. For puffed wild rice, deep-fry 25gm uncooked wild rice for 10-20 seconds at 190C, then remove with a fine skimmer or drain in a sieve and cool on paper towels; otherwise use regular puffed rice.
