Boil the tomato or blanch it in hot water. Peel the skin, then puree in a blender. Discard all the seeds and set aside
Boil the carrot in a separate pot until tender. Set aside
Meanwhile, melt the butter in a pot. Add onion and garlic; cook for 4-5 minutes. Make sure the garlic doesn't get burnt. Add diced chicken and continue cooking until the chicken is fully cooked
Add chicken stock, carrot, sausage, peas, and tomato paste. Adjust the taste by adding salt, pepper, and sugar
Thicken the soup with cornstarch, then serve it right away