Per la preparazione delle quenelle gratinate di mais corvino: in una casseruola portare a bollore il latte e l’acqua con 30 g di burro, il sale e 1 pizzico di noce moscata. Appena spicca il bollore, ritirare la casseruola dal fuoco e aggiungere a pioggia le due farine, mescolando bene. Riportare la casseruola sul fuoco e cuocere a fuoco moderato per almeno 1 ora sempre mescolando. Se la polenta dovesse asciugare troppo, aggiungere un po' di acqua calda.
Una volta cotta la polenta, lasciarla intiepidire e aggiungervi, uno alla volta, i tuorli d'uovo. Lasciare riposare il composto 10-15 minuti in modo che si rapprenda, quindi formare delle quenelle e stenderle una accanto all’altra in una pirofila da forno precedentemente imburrata.
Sciogliere il burro rimasto con il mazzetto odoroso e lo spicchio d'aglio schiacciato. Quando il burro assumerà un leggero color nocciola eliminare gli odori, versarlo sulle quenelle di mais corvino e cospargere con il Gruyére grattugiato e il pangrattato.
Cuocere in forno preriscaldato a 190°C per 10 minuti sino a doratura.
Per la preparazione della salsa al formaggio: in un pentolino aggiungere il burro e la farina, portare a temperatura e cuocere a fuoco medio per qualche istante, quindi unire il latte e cuocere fino ad addensamento. Aggiungere il formaggio e continuare la cottura a fuoco medio fino a quando si sarà completamente sciolto. Aggiustare di sale.
Servire le quenelle gratinate da sole o accompagnate con la salsa al formaggio.
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