Wash the potatoes and cook covered in water for about 20 minutes. Wash and halve the tomatoes. Clean and wash spring onions. Cut 2 spring onions into rings. Wash thyme, shake dry and chop except for something to garnish.
Quench the potatoes, peel them and press them hot through a potato ricer. Knead in eggs and starch. Season with salt, pepper and thyme. Divide cheese into 8 pieces. Form 8 flat thalers from the potato mixture, wrapping the cheese pieces with the mixture.
Fry the tomatoes in 1 tablespoon of hot oil on both sides and braise for about 15 minutes. Season with salt and pepper.
Heat 2 tablespoons of oil in a large frying pan. Fry the thalers in it for about 5 minutes on each side until golden brown. Keep the finished thalers warm. Fry spring onion sticks in the frying fat for 2-3 minutes. Arrange everything. Garnish with remaining thyme and leek onion rings.