On medium to medium-high heat cook bacon until almost crisp, approx. 10 min. Remove & place on plate w/paper towel. Cut bacon up into bite-size pieces.
Cook onion & garlic, stirring frequently until softened but not browned, remove & add to plate with bacon.
Add chicken liver to the pan, and season with thyme, salt & pepper. Cook turning once until slightly pink on the inside. Do not overcook to keep from getting tough. Remove & add to plate with bacon & onions.
Add apple cider vinegar to the pan, scraping the bottom of the pan to remove bacon bits.
Turn the heat off & add everything back into the pan, mix, approx. 30 seconds.
Garnish with parsley.
Remove from heat, and serve immediately.
Notes
If you have a hard time eating liver, gently wash it under cold water first then pat dry before cooking.