The Best Lentil Potluck Salad - Half Cup Habit

Ingredients

• 1/4 cup olive oil
• 1/4 cup apple cider vinegar (raw)
• 1 tbsp maple syrup
• 1 tbsp mustard (stone-ground)
• 2 small cloves garlic
• 2 tsp salt (sea, fine)
• 2 pounds lentils, brown (cooked (2 cups dry is about 6 cups cooked))
• 1 1/2 cups cucumber (diced)
• 1 1/2 cups onion (red; diced)
• 1 1/2 cups bell pepper (red; diced)
• 3 stalks celery (diced)
• 1 cup raisins (golden (optional))
• 1 cup almonds (sliced (optional))
• arugula (for serving (optional))
• black pepper (to taste)