Peppper and Mushroom Salad

For the seasoning:

'1/2 cup olive or vegetable oil'

'1/2 cup red wine vinegar'

'2 tablespoons chopped onion'

'2 tablespoons chopped bell pepper'

'1 minced garlic clove'

'1/2 teaspoon salt'

'1 tablespoon grated ginger'

'1/4 teaspoon ground black pepper'

'1/2 teaspoon paprika'

For the salad:

'2 medium green peppers, seeded and cut into 1 cm wide strips'

'2 medium red peppers, seeded and cut into 1 cm wide strips'

'250g of canned mushrooms, sliced into 0.5 cm thick pieces'

'1/2 cup pitted black olives, small or large, halved'