Place pork in a shallow dish and coat with Italian dressing. Cover and refrigerate for two hours.
For the relish, stir the black olives, green olives, garlic, onion, and peppers together in a bowl; stir in olive oil and balsamic vinegar. Cover and refrigerate until ready to use.
When pork has finished marinating, preheat oven to 300 degrees F (150 degrees C).
Slice the pork loin down the center lengthwise, cutting about 3/4 of the way through to the other side. Stuff full with the olive relish. Cover and bake in the preheated oven for about 2 hours, or until internal temperature has reached 145 degrees F (63 degrees C).

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	271.79 Kcal (1138 kJ)
Calories from fat	84.39 Kcal
		% Daily Value*
Total Fat	9.38g	14%
Cholesterol	114.07mg	38%
Sodium	609.26mg	25%
Potassium	697.05mg	15%
Total Carbs	3.95g	1%
Sugars	1.79g	7%
Dietary Fiber	0.35g	1%
Protein	37.58g	75%
Vitamin C	0.7mg	1%
Iron	2mg	11%
Calcium	16.7mg	2%

Amount Per 100 g
Calories	108.92 Kcal (456 kJ)
Calories from fat	33.82 Kcal
		% Daily Value*
Total Fat	3.76g	14%
Cholesterol	45.71mg	38%
Sodium	244.16mg	25%
Potassium	279.34mg	15%
Total Carbs	1.58g	1%
Sugars	0.72g	7%
Dietary Fiber	0.14g	1%
Protein	15.06g	75%
Vitamin C	0.3mg	1%
Iron	0.8mg	11%
Calcium	6.7mg	2%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.