public List<WeightedValue> GetGroups()
{
return new List<WeightedValue>
{
new WeightedValue("topping_ingredient", topping_ingredient1, topping_ingredient1_weight),
new WeightedValue("topping_ingredient", topping_ingredient2, topping_ingredient2_weight),
new WeightedValue("topping_ingredient", topping_ingredient3, topping_ingredient3_weight),
};
}