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1
Cut the radicchio in quarters lengthwise, being sure to keep some of the stem attached to each quarter.
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2
Trim off any dark bits of stem.
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3
Submerge the radicchio quarters in ice water for 1 hour to remove some bitterness.
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4
Put a plate on top of the radicchio to keep them under water.
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5
In a medium bowl, combine all ingredients except the mozzarella.
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6
Mix well.
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7
Prepare a hot fire in your grill, or heat a cast iron grill pan over medium-high heat.
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8
Drain the radicchio and place them on paper towels to absorb remaining water.
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9
Open up the leaves and spoon the olive oil mixture inside.
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10
Place the radicchio quarters on a baking sheet and pour the remaining marinade mixture.
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11
Season generously with salt and pepper.
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12
Grill the radicchio until browned on the outside but still raw in the center, 3 to 5 minutes, turning occasionally.
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13
Be careful, as the oil mixture may flame up.
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14
When the radicchio begins to brown, pull from the grill, open up a section of each portion and place a slice of mozzarella inside.
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15
Place quarters back onto the sheet pan and place the pan directly on the grill for 5 minutes to melt the cheese.
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16
Drizzle any leftover dressing over the top of the grilled radicchio and serve warm.
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17
If making radicchio in advance: Before the party, have the radicchio drained and marinated in the vinaigrette in the refrigerator.
