In an airtight container or sealable plastic bag, combine Saskatoon or Blueberry jam or jelly, lemon juice, ginger, garlic, oil and soy sauce. Set aside ½ cup (125 mL) of the sauce for serving. Add pork tenderloins to the container and marinate 2 to 24 hours in the refrigerator.
Pre-heat oven to 400°F (200°C). Discard marinade and place tenderloins on a foil-lined baking sheet. Bake for 20 - 25 minutes or until internal temperature reaches 155°F (68°C). Remove from oven; tent loosely with foil (internal temperature will rise to 160°F/71°C).
Heat reserved sauce in a small saucepan and serve drizzled over slice pork tenderloin. Serve with roasted potatoes and seasonal vegetables.