Prepare the watermelon: Use a sharp chef's knife to trim away the rind, then slice the watermelon into thin wedges or triangles.
Prepare the halloumi: Slice halloumi and add to a pan on medium heat. Once nicely browned, flip, about 3 minutes per side.
Prep shallot: Thinly slice half the shallot and dice the other half. Add the slices to water to soften the bite. Set aside the diced shallot for the vinaigrette.
Prep vinaigrette: Zest lime and set aside. Slice lime and make vinaigrette by combining olive oil, diced shallot, honey, lime, salt and pepper in a jar and shake until combined.
Assembly: Layer halloumi and watermelon on a large plate. Top with sliced shallots and drizzle with vinaigrette, and top with chopped mint and lime zest.