Combine lime peel, limejuice, ginger, 5-spice powder, sugar, salt, pepper and 1 tbs oil in 2-quart dish; add salmon; turn to coat.
Cover; refrigerate 2 to 3 hours.
Combine spinach, garlic and remaining 1 tbs oil in 3-quart microwavable dish; toss.
Cover; microwave on "high" 2 minutes or until spinach is wilted.
Drain; keep warm.
Meanwhile, prepare barbecue grill for direct cooking.
Remove salmon from marinade and place on oiled grid.
Brush salmon with marinade.
Grill salmon, covered, over medium-hot coals 4 minutes.
Turn salmon; brush with marinade and grill 4 minutes or until salmon begins to flake with fork.
Discard remaining marinade.
Serve fish over bed of spinach.
Ready in 2 hours and 10 min.