Soften the membrillo in a large bowl with the apple juice, 1 tablespoon of the oil and the spices, salt and pepper. Stir in the chicken pieces and leave to marinate for 10 minutes.
Place the tomato wedges on a plate and scatter with torn or chopped herbs, vinegar and 1 tablespoon oil.
Heat a large frying pan over a medium heat, add the remaining 1 tablespoon oil, then put in the pieces of chicken in one layer and fry for about 3 minutes on each side until caramelised and cooked through.
Serve on a bed of rice and quinoa and mixed vegetables with the tomato salad.