Preheat the oven to 200oC, Gas Mark 6. Lightly grease a large baking sheet.
Mix the flour and seasoning in a wide bowl. Working in batches, coat the fish strips in the seasoned flour, egg and then breadcrumbs. Arrange in a single layer on the baking sheet.
Drizzle the goujons with a little olive oil and bake for about 10 minutes, turning over halfway until the fish is firm and cooked through.
Meanwhile, make the salsa. Halve and stone the avocado and use a teaspoon to scoop chunks of flesh into a bowl. Gently mix with the other ingredients and season to taste with salt and pepper.
Serve the baked goujons immediately with the tomato sauce.