Sun-dried tomato, pesto and salami muffins

Name: Sun-dried tomato, pesto and salami muffins
Prep time: 20 min
Cook time: 25 min
Total time: 45 min
Cuisine: European, Italian, Mediterranean
Ingredients: 2 1/2 cups self-raising flour; 1 tbsp caster sugar; 3/4 cup milk; 1 egg, lightly beaten; 1/2 cup vegetable oil; 1/2 cup drained sun-dried tomato strips in oil, chopped; 2 tbsp basil pesto; 50g sliced mild salami, chopped; 1 tbsp milk, extra; 1 garlic clove, thinly sliced; Softened butter, to serve