In very large resealable bag, combine ketchup, water, garlic sauce, brown sugar, vinegar and mustard.
Add turkey thighs and seal bag; massage to coat well. Refrigerate for at least 1 hour or up to 24 hours.
Place thighs and marinade into large roasting pan.
Cover and bake in preheated 400°F (200°C) oven for 30 to 45 minutes.
Uncover and turn over thighs. Return to oven and bake for about 15 minutes or until juices are no longer pink and instant read thermometer registers 165°F (74°C).
BBQ Variation:
Combine marinade ingredients in bowl and set aside.
Place turkey thighs on greased grill over medium high heat and grill for about 10 minutes.
Turn over and reduce heat to medium.
Grill and brush with sauce liberally for 20 to 30 minutes or until juices are no longer pink and nstant read thermometer registers 165°F (74°C).
Slow Cooker Variation:
Place marinated turkey thighs and marinade into 5 or 6 quart (4 or 5 L) slow cooker.
Cover and cook on Low for 10 to 12 hours or on High for 6 to 8 hours.
Serve with salad and rice, gluten-free noodles or leftover mashed potatoes.
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