How to Make It
In a small bowl, whisk together the lime juice, mustard, salt and pepper. Slowly drizzle in the oils, whisking constantly until thickened. Stir in the shallots and lime zest. Add the chives 15 minutes before serving.
Put the avocados in a large bowl and toss with the lime juice. Fold in the shrimp, red bell pepper, tomatoes and scallions. Add the dressing and toss gently. Just before serving, toss with the fresh mint leaves. Serve immediately.