How do meals and the consumption of food express differences in ideas of friendship and trust?

Food plays a significant role in The Lion, the Witch, and the Wardrobe.
Jadis, the white witch, uses food to manipulate and control. She offers Edmund Turkish Delight as a treat, but then she refuses to give him more until he brings his siblings to her. In friendships, manipulation and control are the opposite of trust. Her use of food to place a spell on Edmund shows her evil intent and lack of friendship for the children.
In contrast, the Beavers offer the four Pevensies a feast when they arrive at the dam after a long journey. This show of friendship is exactly that, friendship. The Beavers have been waiting for the four Sons of Adam and Daughters of Eve to arrive, and they greet the Pevensies like heroes.

The consumption of food is an important element in The Lion, The Witch, and The Wardrobe. However, there is a stark difference between how various characters approach this basic human need. In this novel, the consumption of food highlights differing ideas about friendship and trust.
Take for instance, the meal the four children share with Mr. and Mrs. Beaver in chapter 7. The text tells us that the girls help the Beavers get the meal ready. They cut the bread and put the plates in the oven to warm. They also set the table. Meanwhile, Peter helps Mr. Beaver catch the fish for their meal. Just before the meal begins, Susan drains the potatoes and puts them back in the pot to dry. The picture we get here is of a close-knit group working together to prepare a delicious meal. There is camaraderie and, obviously, trust. Good food and its consumption are portrayed as an intrinsic element of a joyful social gathering.
On the other hand, food is used as a weapon by the White Witch. During her initial meeting with Edmund, she showers him with a seemingly perpetual supply of Turkish Delight. Her purpose, however, is to get as much information as she can out of Edmund. We later learn that the Witch means to use Edmund to betray his siblings. Edmund is now susceptible to the Witch's manipulations because he feels marginalized and out of sorts.
From Edmund's point of view, life is pretty bleak. World War II is raging, and he is far from his family home. Meanwhile, he seems to get into never-ending, petty quarrels with his siblings. When the Witch makes him an offer he ca not refuse, Edmund falls into her trap. His trust in her leads him to believe that he will rule as King of Narnia after the Witch dies. However, Edmund's trust here differs from the trust shared between his siblings and the Beavers. While Edmund's siblings and the Beavers trust that their shared efforts will defeat the Witch, Edmund trusts that betraying his siblings will restore his injured pride.
For her part, the Witch uses food as a weapon to realize her evil plans for Narnia. When Edmund shows up at her castle mansion without his siblings, she is furious. Instead of feeding him Turkish Delight, she feeds him stale bread and plain water.
The Witch views food and its consumption differently from the Beavers (and Edmund's siblings). For the latter, food is the means of uniting a group engaged in a worthy purpose. On the other hand, the Witch views food and the human appetite for delicacies as a weapon to be wielded for her own evil purposes.