Salad of roasted peppers with walnuts

pepper 1 kg (10 pcs.)
walnuts 150g (1 cup)
garlic 1/2 head
1 tomato
vegetable oil 50 ml (1/4 cup)
lemon juice 10 ml (1 tablespoon)
salt 3 grams (1/2 teaspoon)
1 bunch parsley