Cauliflour tomato stir fry

• 10 oz Chinese cauliflower florets or regular cauliflower (about 1/2 head cauliflower) (* see footnote 1)
• 1 tablespoon peanut oil (or vegetable oil)
• 1 tomato , diced
• 2 cloves garlic , sliced
• 2 tablespoons tomato paste
• 2 teaspoons sugar
• 1/2 teaspoon salt (or to taste)