stasu gismu

x₁ is a quantity of soup/stew/olla/olio [food] of ingredients including x₂.

x₂ is in x₁, an ingredient/part/component of x₁. See also sanmi, mixre, salta, sanso.

In notes:

mixre: x₁ (mass) is a mixture/blend/colloid/commingling with ingredients including x₂.
salta: x₁ (mass) is a quantity of salad [food] with ingredients/components including x₂.
sanmi: x₁ (mass) is a meal composed of dishes including x₂.
sanso: x₁ is a sauce/topping/gravy/frosting for use with x₂, containing ingredient(s) including x₃.
bruloni: x₁ is some broth, liquid (usually water) in which food (meat or vegetable etc) has been boiled.