Which parts of mustard plant are used as food?

Explanation

**Step-by-Step Solution:**

1. **Identify the Plant**: The question asks about the mustard plant, which is known for its various edible parts.

2. **First Edible Part - Seeds**: The first part of the mustard plant that is used as food is the seeds. Mustard seeds are primarily used to produce mustard oil, which is a common cooking oil in many cuisines.

3. **Second Edible Part - Leaves**: The second part of the mustard plant that is consumed is the leaves. Mustard leaves are used as a vegetable and are popular in various dishes and recipes.

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