Preheat smoker to 225 degrees. Coat board shoulder with mustard and then cover with salt, pepper, garlic powder, and paprika. Smoke for 2 hours. After 2 hours, baste with apple juice. Continue cooking for another hour or until the internal temperature reaches 160 degrees. Wrap shoulder in tin foil and re-baste with apple juice. Cook until internal temp is 190 degrees, about another 2 hours. Let meat rest for 1 hour and shred or slice.
Slice baguette lengthwise. Coat sides with olive oil and toast on the grill. Slather bread with mayonnaise and tomato jam. Top with wild boar and a couple of lettuce leaves, and serve.