In a very large nonstick skillet cook sausage slices over medium-high heat for 3 minutes or until sausage is heated through and browned, stirring occasionally (see Tip). Reduce heat to medium-low and add syrup, tossing to coat sausage. Remove sausage from skillet using a slotted spoon; cover and keep warm.
Add broth, onion, sage and pepper to skillet. Cook for 3 to 5 minutes or until onion is just tender, stirring occasionally. Increase heat to medium. Add spinach to hot skillet; cover and cook for 1 to 2 minutes or until spinach is just wilted, tossing once.
Divide spinach evenly among four serving plates. Top with sausage slices.
Tip: Make sure your skillet is at least 12 inches in diameter. It needs to be this large to accommodate the 10 cups of fresh spinach. Use long-handled tongs to easily grab and toss the spinach in the skillet after 30 seconds of cooking.