In a large bowl, toss together the greens, mushrooms, and bell pepper. Set aside.
In a shallow dish, stir together the oil, curry paste, lemon juice, ginger, and salt. Add the shrimp and, using your hands, toss to coat the shrimp evenly.
Preheat the grill or broiler and lightly oil the grill rack or a baking sheet. If you plan to grill the shrimp, thread them onto skewers; if you plan to broil them, spread them on the baking sheet. Grill or broil the shrimp over high heat, turning once, until pink and firm, about 4 minutes.
Make the Orange Dressing: In a small bowl, whisk together the oil, orange zest, orange and lemon juices, mustard, mint, garlic, and salt. Pour the dressing over the greens and toss to coat.
Spread the cooked shrimp over the greens and serve immediately.