There is 1 halal butcher, approx 2 mins walk from the mosque.
Pleven Center, ul. "Ivan Vazov" 31, 5809 Pleven, Bulgaria
+359 89 626 2759
No livestock on site but it is brought in. Restocking usually happens on Thursday. Has usual meat but also sweets, baked goods etc.
Kaufland also has halal chicken but only this certain brand with the blue writing on it “Cocorico”
the one halal restaurant in Pleven, Indian restaurant. It is directly opposite the mosque.
Pleven Center, ul. "Georgi S. Rakovski" 45, 5803 Pleven, Bulgaria
For other options, you can get vegetarian food, just ensure cooked separately and no wine used in cooking.
If you have a cooler bag , you also have the option of going to Sofia and batch buying a whole load of meat once, could potentially be cheaper.