1 - large onion, cut into 1/4-inch-thick slices, separated into rings
1/3 - cup maple-flavored syrup
1/4 - cup country-style Dijon mustard
2-1/2 to 3 - pounds country-style pork ribs, trimmed of fat, cut into 3-inch pieces

• In 3-1/2 to 4-quart slow cooker, first place the onion rings.
  
• In a small bowl, mix the syrup and mustard; mix well. 
• Spread evenly over ribs.
  
• Place coated ribs over onion.
  
• Cover and cook LOW for 8 hours.
  
• If desired, serve with additional mustard.