How to Make It
Light a grill or preheat the broiler. Grill or broil the bell peppers for about 5 minutes per side, or until the skins are blistered and charred. Transfer the peppers to a medium bowl, cover with plastic wrap and let steam for 20 minutes. Peel, core and seed the peppers and cut them into 1-inch-wide strips.
Slice the eggplants lengthwise, keeping the slices attached at the stem. Fan them out by pressing down with your hands. Generously brush the eggplants, onion and zucchini with the mojo, reserving 1 tablespoon for the dressing. Grill or broil the vegetables for 20 minutes, or until the eggplant and zucchini are tender and the onion is charred and crisp-tender. Carefully peel the onion and cut it into 1-inch slices.
In a large bowl, whisk the reserved 1 tablespoon of mojo with the red wine vinegar; slowly whisk in the olive oil until emulsified. Add the romaine and watercress, season with salt and pepper and toss to combine. Transfer the greens to a serving platter and arrange the grilled vegetables on top. Garnish with basil leaves and serve.