Preheat oven (electric cooker: 220 °C/circulating air: 200 °C/gas: see manufacturer). Line a tray with baking paper. Drain the lenses. Wash and halve the tomatoes.
Clean, wash and cut spring onions into pieces. Mix lemon juice, mustard, salt and pepper. Fold in the oil. Mix lentils, tomatoes, spring onions and vinaigrette.
Wash the rosemary, pluck the needles. Cut goat cheese into 8-12 slices. Put the cheese coins on the tray. Sprinkle with honey, sprinkle with rosemary. Bake in a hot oven for about 4 minutes. Serve salad with cheese taler. Roast bread goes well with it.