Prepare a grill for medium-heat cooking. In a small bowl, whisk together honey with 1 tablespoon very hot water.
Brush cut side of fruit with honey mixture and grill 8 to 10 minutes or until tender and lightly charred, turning over halfway through grilling and brushing again with honey mixture.
Grill cake slices 2 to 3 minutes or until lightly charred on both sides. Coarsely chop grilled fruit (some skins might slip off, but it’s not necessary to remove all skins). Toss fruit with thyme and any remaining honey mixture until evenly combined. Cut grilled cake into bite-size pieces.
Layer half of the cake pieces in a glass trifle dish or clear glass bowl. Top with half of the fruit and half of the yogurt. Repeat with remaining ingredients (reserving 1/4 cup fruit mixture for top of trifle).
Keep refrigerated and serve within 1 day of assembly.
Per Serving:170 calories (5 from fat), 0.5g total fat, 125mg sodium, 38g carbohydrates, (3 g dietary fiber, 19g sugar), 5g protein.