Combine lamb, salt, pepper, and oregano in a bowl and mix thorughly with your hands. Allow to sit 1 hour (or overnight) covered in fridge.
Preheat oven to 300°F (150°C).
Purée lamb, onion, garlic, and bacon in food processor (or a robust blender) until smooth.
Line a baking sheet with parchment paper. Smash mixture out into a slab approximately 1.5" thick and 5"×8". Bake until internal temp is 155°F (68°C), about 30 minutes.
Let rest 15 minutes at room temp or refrigeate.
Before serving, slice into 1/8 to 1/4" strips, place on aluminum-foil lined pan on highest rack, and broil for about two minutes until edges are crisp.