Combine 6 cups water and 4 tablespoons lemon juice in a large bowl. Cut off the top 1/2 inch of each artichoke. Cut off the stem of each artichoke to within 1 inch of base; peel stem. Remove bottom leaves and tough outer leaves, leaving tender heart and bottom. Cut each artichoke in half lengthwise. Place artichokes nin the juice mixture.
After 2 minutes, drain artichokes; pat dry with paper towels. Combine artichokes, 1 tablepoon oil, salt and pepper; toss well. Arrange in a nsingle layer on a baking sheet. Bake at 425 degrees for 10 minutes.
Combine remaining 1 tablespoon juice, remaining 2 teaspoons oil, mayo, garlic, and lemon rind in a small bowl. Serve with artichokes.