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Heat a large skillet to medium high heat. Once hot, coat with olive oil and add garlic, onion, and jalapeño peppers. Saute for 3-5 minutes.
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Add tenderloin and sear on all sides, 2-3 minutes time total. Place tenderloin and veggies into the slow cooker.
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In a small bowl mix together maple syrup, coconut aminos (or soy sauce if using), mustard, and vinegar. Pour sauce on top of the tenderloin.
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Set your slow cooker to low. Cook for 4-6 hours or until fork tender and cooked through. If using two smaller tenderloins it may cook only 4 hours, if you have one large tenderloin it cook take up to 6 hours.
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Place arrowroot starch in a bowl and mix with 2 tbsp water. Pour inside the slow cooker and let thicken for the last 10 minutes of cooking.
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Slice or shred the tenderloin and serve immediately with sauce.