Broccoli and Radicchio with Blistered Grapes

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2 tablespoons olive oil

1 cup red seedless grapes, halved 

1 head radicchio Trevisano, cored and quartered lengthwise, or 1 head radicchio, sliced 1/2 inch thick 

1 bunch broccoli, cut into florets (reserve the stalk for another use)

1/4 red onion, sliced 

Aioli:

1 tablespoon olive oil

1 tablespoon mayonnaise 

1/4 teaspoon finely grated lemon zest 

1 clove garlic, minced