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Spread the mixture into a baking sheet, cover with plastic and place in the refrigerator until cold and very firm, about 4 hours. When the polenta is firm, remove from the refrigerator and, using a 2-inch ring mold, cut out circles of the polenta.
Preheat a grill to medium-high.
Season the polenta circles with salt and pepper on both sides, brush with oil and grill on both sides until golden brown, about 2 to 3 minutes per side. Remove from grill, drizzle with chive oil and garnish with lemon zest and chives.